Question

高中英语问题

谁帮忙辨析一下这两个题：
1、____ twice a year,whether it is a car or a bus or a truck,is the rule that every drive must obey in this city.
A.Examining B.Examined C.Being examined D.Have been examined
2、Though ____ of danger,sightseers have been flocking to the site where the world's biggest terrorist Bin Laden lived.
A.warned B.warning C.being warned D.having warned

Answer 1

第一题选A （动名词作主语），你把,whether it is a car or a bus or a truck,去掉（同位语）。the rule that every drive must obey in this city.中把that引导的同位语从句也去掉，所以经简化，就是Examining twice a year is the rule 。
第二题选A，（过去分词短语做让步壮语）其实这句话就是Though sightseers are warned of danger，they have been flocking to the site where the world's biggest terrorist Bin Laden lived.
的一种省略形式【所以，只要在在状语从句中，都可以用现在分词（主动或进行时），过去分词（被动或完成时）替代连接词（如if though when 等）和主语谓语】

Answer 2

1.C
Being examined twice a year, ..., is the rule, ...
动名词作主语

2.A
“连词+分词”省略“主语+be"
Though warned of danger=Though sightseers have been warned of danger, ...

追问

为什么第2题要省略不选C呢，而第1题不省略，求详细

Answer 3

D,C

Answer 4

C
C