单项选择题

It was a paper plane ______ I made yesterday.

A． that
B． who
C． which
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单项选择题
She is often ______ at by her classmates.
A． laughed
B． laugh
C． laughs
单项选择题
It' s getting dark. Please ______ the light.
A． turn on
B． turn off
C． turn down
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