单项选择题

After the cameraman had taken two photographs of the ants, he found they had ___________ all over his feet.

A．flocked
B．swarmed
C．gathered
D．crowded
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单项选择题
All the parts of these washing machines are ___________ ,so that it is very convenient to get replacement for them.
A．mechanized
B．modernized
C．standardized
D．normalized
单项选择题
After looking through the students' homework, he ___________ to have the geography class.
A．proceeded
B．processed
C．presided
D．preceded
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