单项选择题

As long as you ______ it in mind, you will never fail.

A．have
B．learn
C．keep
D．remember
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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
I'd rather you ______ up now.
A．wash
B．washed
C．don't wash
D．haven't washed
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