单项选择题

To produce a mighty book, you must choose a great ______.

A．matter
B．topic
C．theme
D．thesis
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单项选择题
If I hadn't given you a hand in time of crisis, you ______ on air now.
A．couldn't have put
B．wouldn't be putting
C．didn't put
D．won't put
单项选择题
Nancy was surprised that they have ______ . They seemed to be a happy couple.
A．split up
B．broken down
C．fallen through
D．cut off
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