单项选择题

All flights （） because of the terrible weather, they had to go there by train.

A. having been canceled
B. had been canceled
C. having canceled
D. were canceled

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单项选择题
The problem of （） to select as his successor was quickly disposed of.

A. what
B. whom
C. which
D. how
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The police accused him of setting fire to the building but he denied （） in the area on the night of the fire.

A. to be
B. to have been
C. having been
D. be
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