单项选择题

You are late for work again, Miss Jane. You ______ here half an hour earlier.

A．must be
B．could have been
C．may have been
D．should have been
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单项选择题
It will be a great advantage to be able to speak a foreign language, especially if you are ______ business.
A．to
B．with
C．on
D．in
单项选择题
______ they change the coach, they will lose the match.
A．Until
B．Before
C．Unless
D．Although
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