单项选择题

The girl was heard __________ in the next room.

A． sing
B． to sing
C． sang
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单项选择题
The Turners will make the eagle __________ high in the sky.
A． fly
B． flies
C． flew
单项选择题
It's time for class. Boys and girls, stop __________.
A． talk
B． to talk
C． talking
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