单项选择题

So many students ______ the teacher threw the textbook in a fit of anger.

[A] were absent-minded
[B] be absent-minded
[C] been absent-minded
[D] being absent-minded

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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

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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