单项选择题

They U. S will never again have as a nation the spirit of adventure as it（）before the West was settled.

A. could
B. was
C. would
D. did

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单项选择题
The residents,（）had been damaged by the flood, were given help by the government.

A. all their homes
B. all of which homes
C. all of whose homes
D. all of their homes
单项选择题
It is recommended that the project（）until all the preparations have been made.

A. is not started
B. will not be started
C. not be started
D. is not to be started
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