语法练习

1.Of all the economically important trees, palms have been ___.

A.the last studied
B.study the least
C.study less and less
D.to study the less

2.Not only ___ to determine the depth of the ocean floor, but it is also used to locate oil.

A.to use seismology
B.is seismology used
C.seismology is used
D.using seismology

3.It's high time someone ___ him to stop behaving like a child.

A.will tell
B.told
C.tell
D.should tell

4.___ the English examination, I would have gone to the concert last Sunday.

A.In spite of
B.But for
C.Because of
D.As for

5.The morning class ___ over, students rushed out of the classroom for lunch.

A.was
B.is
C.having been
D.being

答案详解

1.[A]【解析】the least studied意为“被研究得最少”。这里使用率动词现在完成时的被动语态。

2.[B]【解析】not only放在句首时句子要用倒装语序，将系动词、助动词或情态动词放到主语之前。

3.[B]【解析】在it's high/about time...结构中，谓语动词通常用过去时，指现在或将来的情况，意为“早该做某事了”。

4.[B]【解析】but for意为“要不是”，引导含蓄虚拟条件句。

5.[D]【解析】独立主格的现在分词形式，在句中作状语。