题目内容

It is necessary that our drinking water _____ cleaner.

A. should be made
B. is made
C. would be made
D. was made

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It is high time that our child _____ to do some housework.

A. learned
B. learn
C. will learn
D. would learn

_ it _ for your help, I couldn’t have made any progress.

A. Were; not
B. Had; not been
C. Should; not been
Did; be

为了预防漏接事故，导游应保证按规定提前（）分钟到达接站地点。

A. 40
B. 30
C. 20
D. 10

He suggested that the meeting _____ put off.

A. not be
B. should not
C. wouldn't
D. be not