At 8 p.m. last night / they / watch TV / when the power / go out.

A. At 8 p.m. last night they watched TV when the power was going out.

B. At 8 p.m. last night they were watching TV when the power went out.

C. At 8 p.m. last night they are watching TV when the power went out.

D. At 8 p.m. last night they were watching TV when the power go out.

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