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 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
No sooner（）arrived at the station than it began to snow.

A. had I
B. I had
C. have I
D. I have
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