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
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单项选择题
To produce a mighty book, you must choose a great
A．matter
B．topic
C．theme
D．thesis
单项选择题
Mary ______ that the purchase had been a mistake. However, she didn't.
A．ought to acknowledged
B．ought to have acknowledged
C．should acknowledge
D．should be acknowledging
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