单项选择题

（）we have done too much for the chance to come here, we must work hard.

A．Since that
B．For
C．As
D．Because of

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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
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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