单项选择题

You can't hear what I'm saying ______ you stop talking.

A．only if
B．unless
C．lest
D．except that
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I ______ get this done immediately or it will be too late.
A．must
B．can
C．may
D．might
单项选择题
You ought to take every ______ of improving your English.
A．time
B．thing
C．chance
D．case
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