题目内容
The students were studying in ________ classroom when, all of ________ sudden, the lights went out．
[ ]
A．the; a
B．不填；a
C．a; a
D．a; the
答案：A
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题目内容
The students were studying in ________ classroom when, all of ________ sudden, the lights went out．
A．the; a
B．不填；a
C．a; a
D．a; the