单项选择题

All the preparations for the task_________, and we"re ready to start.

A．have been completed
B．completed
C．complete
D．have completed
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单项选择题
We have produced twice as much steel this year___________4 years ago．
A．than we did
B．as we did
C．than we have produced
D．as we have produced
单项选择题
Camels can ________ in the desert on very little water.
A．conquer
B．overcome
C．recover
D．survive
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