单项选择题

The alarm clock didn't ring this morning. I ______ it last night.

A．did forgotten to wind
B．may have forgotten winding
C．ought to have forgotten to wind
D．must have forgotten to wind
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单项选择题
We could do nothing but ______ till he came back.
A．to wait
B．waiting
C．wait
D．waited
单项选择题
The author believes that in a nation where free enterprise (自由企业制 ) exists , manufacturers will produce ______.
A．as much as they like
B．better quality merchandise (商品)
C．more than they are able to sell
D．both A and B
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