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
The unrighteous officer prefers to resign ______ part in such dishonest business deals.
A．than take
B．than to take
C．rather than take
D．rather than to take
单项选择题
When the boy came back years later, he found the empty old house there.
A．none but
B．none other than
C．nothing but
D．no other than
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