题目内容
The students were studying in____________classroom when, all of ____________sudden,the lights went out.
A．不填;不填 B．a;the C．the;a D．the；不填
C
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题目内容
The students were studying in____________classroom when, all of ____________sudden,the lights went out.
A．不填;不填 B．a;the C．the;a D．the；不填
C