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
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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
单项选择题
You cannot master a foreign language ______ you work hard at it.
A．unless
B．when
C．if
D．so
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