单项选择题

There is a need to protect society from dangerous children as there was a fear that roaming, unsupervised youngsters ______ a threat to social order.

A. imposed
B. posed
C. aroused
D. spurred
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单项选择题
She hates ______ and wonders if she should ever have chosen a career in television.
A. to be photographed
B. photographing
C. being photographed
D. having been photographed
单项选择题
Darwin, by the time he ______ the Galapagos Islands, was not in a particularly receptive or philosophical frame of mind.
A. had reached
B. reached
C. would have reached
D. had been reaching
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