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
Others viewed the findings with ______, noting that a cause-and-effect relationship between passive smoking and cancer remains to be shown.
A．caution
B．passion
C．optimism
D．deliberation
单项选择题
He raised his eyebrows and stuck his head forward and ______ it in a single nod, a gesture boys used then for OK when they were pleased.
A．jerked
B．twisted
C．shrugged
D．tugged
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