单项选择题

The riot is said ______ by the government’s negligence of the people’s welfare.

A. to have been caused

B. being caused
C. to be caused


D. to cause
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单项选择题
He ______ killed last night if he had taken part in the surprise attack on the city.
A. would be



B. should have been
C. must have been


D. might have been
单项选择题
______, the mountain looks like an elephant.
A. Having seen from a distance
B. Having been seen from a distance
C. Seeing from a distance

D. Seen from a distance
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