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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单项选择题

Who can predict the misery that may ______ humankind

[A] happen
[B] befall
[C] chance
[D] occur

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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