The students were studying inclassroom when all of sudden the lights went out. A. 不填;不填B.

问题补充：

The students were studying inclassroom when, all of sudden,the lights went out.

A. 不填;不填

B. a;the

C. the;a

D. the；不填

答案：

A. 不填;不填

B. a;the

(答案→)C. the;a

D. the；不填

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