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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You cannot master a foreign language ______ you work hard at it.
A．unless
B．when
C．if
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There are forty students in our class. ______ of them are League members.
A．No one
B．Both
C．All
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