单项选择题

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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单项选择题
I didn't actually see them ______ the safe, but I heard them ______ about that.
A．open, talk
B．to open, talk
C．open, talking
D．to open, talking
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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