单项选择题

Nancy was surprised that they have ______ . They seemed to be a happy couple.

[A] split up
[B] broken down
[C] fallen through
[D] cut off
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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
Who can predict the misery that may ______ humankind
[A] happen
[B] befall
[C] chance
[D] occur
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