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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There was an accident in this street this morning and ______ there has been a severe congestion of traffic.
A．until that
B．since then
C．for which
D．after that
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Do you like your new job Yes, it's very ______ work.
A．enjoyable
B．joyful
C．enjoyed
D．enjoying
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