单项选择题

The building of the road ______ by bad weather.

A. has held up

B. has been held up
C. was held

D. hold up
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单项选择题
Climate change will greatly () wheat and rice production if nations don't take steps now.

A. fall
B. leak
C. lack
D. reduce
单项选择题
The house ______ I grew up has been taken down and replaced by an office building.
A. in it
B. in what
C. in that
D. in which
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