单项选择题

Burton said he could not swim until the ______ came in because the sea was too far out.

A．current
B．tide
C．water
D．flood
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单项选择题
The pressure ______ causes Americans to be energetic, but it also puts them under a constant emotional strain.
A．to compete
B．competing
C．to be competed
D．having competed
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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