单项选择题

So far every means（）tried, but we have not come up with a solution to the problem.

A．is
B．has been
C．are
D．have been

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单项选择题

She（）have missed the first bus, or she（）be here so early.

A．needn't, shouldn't
B．couldn't can't
C．shouldn't, mayn't
D．mustn't, wouldn't

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