单项选择题

A small percentage of the grain ______ ruined by the prolonged rain.

A．was
B．were
C．is
D．are
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单项选择题
I should have told you! You ______ the entire house. Our cleaning lady phoned she's coming tomorrow.
A．didn't need to clean
B．needn't have cleaned
C．don't need to clean
D．mustn't have cleaned
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