单项选择题

If Watergate ________, Nixon would not have resigned from presidency.

A．had not occurred
B．did not occur
C．was not occurring
D．would not occur
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She knew him well enough to ________ his laughter and realize he was upset about what had happened.
A．see about
B．see out
C．see through
D．see to
单项选择题
How much does it cost you to ________ your large house and garden
A．keep back
B．keep down
C．keep on
D．keep up
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