单项选择题

Nothing can ______ unless you tell us the truth.

A．do
B．does
C．have been done
D．be done
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单项选择题
No sooner had we started the exam than it ______ to snow.
A．begin
B．begins
C．began
D．is beginning
单项选择题
The more you know about it, ______.
A．the more happy you are
B．you are more happy
C．the happier are you
D．the happier you are
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