Question

请教几道英语选择题。求解题思路。

Which subject is ______ to learn , physics or chemistry?
A.easy B.easier C. the easier D.more easier
It's well ______ that the earth ______around the sun .
A.know ; goes B.knew;going C.knows;going D.known ;goes
One of the suspects ______ down Zhongshan Road at 9:00 last night.
A.was seen to run B.was seen running C.were seen to run D.were seen running

Answer 1

B 两者的比较，用比较级，比较级前面不加the
D it is well known that是固定句型；“地球绕着太阳转”是客观真理，所以用一般现在时
A 主语是一个人，所以谓语用was；这里很容易误选为B，认为是see sb. doing sth.和see sb. to do sth.的区别，其实不然，see这个词被动的时候就是用be seen to do，因此选B

Answer 2

B 这类题目解题时将疑问句改为陈述句，it is easier to learn...有一个固定句式是it is easy to do，加上比较级就是B
D it is well known that 也是一个固定句式，解释为据说.....that后面跟句子，所以要用谓语动词，就是goes
B see的用法，一个是see sb doing和see sb do,这里看到嫌疑犯跑是瞬间性的，用doing

Answer 3

B 从两个选一个更加容易的。
D It's known that …… 地球绕着太阳转是真理，故用一般现在时。
B 其中一个嫌疑犯，单数用was。被看到正跑过中山路，用进行时。