单项选择题

He ______ for her for one hour by the time she arrived there.

A．has been waiting
B．has waited
C．had been waiting
D．waited
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I will not lend the book to you ______ you can return it in time.
A．in case
B．so that
C．unless
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单项选择题
He is one of the leaders ______ to attend the important international conference.
A．who have been invited
B．who has been invited
C．whom they have invited him
D．whom has been invited
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