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
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单项选择题
______ the same treatment again, he is sure to get well.
A．Giving
B．To give
C．Given
D．D ) Be given
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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