单项选择题

The students must hand in their essays in a week,______ No, they______

A. needn't they...mustn't

B. mustn't they...mustn't
C. mustn't they...needn't

D. shouldn't they...should
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单项选择题
In the experiment we kept a watchful eye______the developments and recorded every detail.
A. in
B. at
C. for
D. on
单项选择题
The program requires more money than
A. have been put in
B. being put in
C. has been put in
D. to be put in
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