单项选择题

Their achievements were remarkable in view of the fact that they ______ rely entirely on their own ingenuity.

A. would
B. must
C. are to
D. had to
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The ceremony has started and the flag ______ now.
A. is being raised
B. is being risen
C. is being
D. is raising
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There was a knock at the door. It was the second time It ______ hat evening.
A. interrupted
B. was interrupting
C. had interrupted
D. had been interrupted
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