单项选择题

There is no light in the dormitory. They must have gone to the lecture, ______

A. didn't they
B. don't they
C. mustn't they
D. haven't they

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单项选择题

I'm going to the supermarket this afternoon. Do you have anything ______

A. to be buying
B. to be bought
C. for buying
D. bought

单项选择题

I have worked with him for some time and have found that he is ______ than John.

A. more efficiently a worker
B. a more efficient worker
C. more an efficient worker
D. a worker more efficiently

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