单项选择题

It is high time that you ______ your work.

A．begin
B．will begin
C．began
D．has begun
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单项选择题
The sun heats the earth, ______ makes it possible for plants to grow.
A．that
B．which
C．where
D．what
单项选择题
By the end of this year, they ______ the construction of the subway.
A．will complete
B．have complete
C．will have completed
D．complete
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