单项选择题

If ______, the two World Trade Center towers in New York City would alone generate 2.25 million gallons of raw sewage each year.

A．fully occupied
B．to fully occupy
C．fully occupying
D．to be occupied fully
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单项选择题
By the end of next month we ______ this assignment.
A．will finish
B．will be finishing
C．will have finished
D．have finished
单项选择题
______ when she started complaining.
A．Not until he arrived
B．Hardly had he arrived
C．No sooner had he arrived
D．Scarcely did he arrive
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