单项选择题

After the cameraman had taken three or four photographs of the soldier ants, he found they had ______ all over his feet.

A．gathered
B．flocked
C．crowded
D．swarmed
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单项选择题
Norris has decided to ______ for some evening classes next term now that he has settled down in New York.
A．enroll
B．enlist
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You ______ drive fast, there is a speed limit here. Moreover, we have plenty of time, so you ______ drive so fast.
A．mustn't, needn't
B．needn't, needn't
C．mustn't, mustn't
D．needn't, mustn't
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