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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单项选择题
Compared with the residents of other cities, residents of Shanghai have a longer life
A．range
B．scale
C．scope
D．span
单项选择题
The building of the new road has been ________ by bad weather.
A．set down
B．held up
C．kept down
D．stood back
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