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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单项选择题
Five pilots landed J-15 fighter jets on the Liaoning, China’s first aircraft carrier, ______ the critics who once described it as a shark without teeth .
A．about
B．above
C．against
D．across
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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