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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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

Prague offers visitors a series of excursions and leads them into a rich and ______ past.

[A] variable
[B] diverse
[C] different
[D] changeable

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