Question

高中语法填空问题

As the plane circled over the airport,everyone sensed that something was wrong.The plane was moving____16____(steady)through the air, and although the passengers ___17___(fasten) their seat belts,they were suddenly thrown forward. At that moment,the air-hostess presented.She looked very pale,__18___ was quite calm.Speaking quickly and almost in a whisper,she informed everyone that the pilot had fainted and asked if ___19___ of the passengers knew anything about machines,After a moment‟s hesitation,___20___ man got up and followed the hostess into the pilot‟s cabin. Moving the pilot aside,the man took his seat and listened carefully to the urgent instructions that ___21___(send) by radio from the airport below.To everyone‟s relief,the plane,__22__ was dangerously close to the ground at the moment ,soon began to climb. The man had to circle the airport several times to become familiar ___23___ the controls of the plane.The critical moment came ___23___ he had to land.The man,____25____(follow) the instructions,guided the plane toward the airfield,and it landed safely after a long run along the runway.
答案16. unsteadily; 17. had fastened; 18. but; 19. any; 20. a; 21. were being sent; 22. which; 23. with; 24. when; 25. following
问题：17和21请详细解析，谢谢！
英语不是很好，所以请解释的清楚一点，把相关的语法点也讲一下，十分感谢！！

Answer 1

这篇短文描述的是

Answer 2

额！这个。。。不知道的说！【瓦素初一的说！当然不会的说！】

Answer 3

16. unsteadily 副词，修饰move这个动词。此句讲“飞机飞行不稳定”。
17. had fastened 过去完成时，表示动作发生在passengers were thrown forward之前。此句讲“虽然乘客们都系好了安全带（发生在被甩出去之前），还是被甩出去了”
18. but 转折连词。此句讲“空姐虽然吓得脸色苍白，但依然很镇定”。
19. any 表示“任何”。any of the passengers意为“任何一位乘客”。
20. a 冠词，表示数量“一”。a man意为“一个男人”，表达不确指的概念。
21. were being sent，过去进行时的被动语态。此句要表达“广播（在那个时候）正在（被）发送”。
22. which，从属连词，在这里引导非限制性定语从句，修饰the plane。
23. be（系动词） familiar with，“对……熟悉”，是固定搭配。
24. when，引导时间状语从句，表示“当……时候”。此句讲“关键的一刻到了，他必须着陆了”。
25. following，现在分词作伴随状语，与man是主动关系。

讲得都比较简略，如果不懂，可以追问。谢谢。：）

追问

问题1：怎么知道它是强调当时收音机正在播放的
问题2：如果……instructions that ___21___(send) by……去掉that应该怎么填 谢谢

追答

Moving the pilot aside,the man took his seat and listened carefully to the urgent instructions that were being sent by radio from the airport below.
此句的大意是：这个人把飞行员安置在一旁，坐上飞行员的座位，认真地听从飞机场广播发送的指令。用过去进行时的被动，强调的“这个人听的时候，广播正在发送指令”。
去掉that的话，being sent和sent都可以（这个时候（being）sent by the radio作instructions的后置定语）。只是being sent同样强调当时正在发生。

Answer 4

→_→好……好多好复杂

Answer 5

16. unsteadily; 副词，意思是“不稳定地”
17. had fastened; 过去完成时表示动作在were suddenly thrown forward之前发生，即在过去的过去发生所以用过去完成时。意思是：乘客虽然已系好的安全带。（由于飞机的不稳定）乘客被迫向前摇晃
18. but; 前后句是转折关系，虽然空姐紧张得脸色发白但是还是很平静。
19. any;条件从句中用any代替some.是否有人懂机器
20. a; 泛指一个人
21. were being sent; 用过去时行时表示那时正在机器发出的指令
22. which; 非限制性定语从句。用which引导
23. with; become/be familiar with 与，，熟悉。这是固定短语
24. when; 引导从句解释前面名词moment
25. following现在分词短语做伴随状语。是谓语动作发生时主语的另一动作。

追问

问题1：怎么知道它是强调当时收音机正在播放的
问题2：如果……instructions that ___21___(send) by……去掉that应该怎么填 谢谢

追答

因为当飞机发生意外事故时飞机上的自动装制会发出指令。 那一定是当时正在发出。所以这个人根据这些处理了后面的事。
如果去掉that就是分词短语做后置定语。表示和被修饰词instructions的被动关系所以用being sent