单项选择题

You cannot master a foreign language（）you work hard at it.

A．unless
B．if
C．when
D．so

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单项选择题

Those who won't work should be made（）

A．worked
B．work
C．to work
D．to be working

单项选择题

It is high time that you（）your work.

A．begin
B．began
C．will begin
D．has begun

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