单项选择题

—How are you doing today —______.

A．You don’t say
B．Couldn’t be better
C．Don’t mention it
D．I can’t help it
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单项选择题
Tom shut everyone out of the lab ______ out the physical experiment.
A．carry
B．carried
C．and carry
D．carrying
单项选择题
You ______ be too cautious when you’re driving especially on the freeway.
A．can’t
B．needn’t
C．mustn’t
D．won’t
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