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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单项选择题
______ I can't help admiring the man's courage, I do not approve of his methods.
A. Unless
B. While
C. Since
D. Although
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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