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

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

单项选择题

For some serious coin collectors, a coin with a different date, mintmark, and even a little ______ in design is counted as a different coin.

A．contrast
B．diversity
C．variation
D．variety

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