They ___TV when the lights went out A,watched b,had watched c,would watched d,werw watching

They ___TV when the lights went out A,watched b,had watched c,would watched d,werw watching

题目
They ___TV when the lights went out A,watched b,had watched c,would watched d,werw watching
请告诉我选什么,为什么?
答案
选D
过去进行时
灯灭的时候他们正在看电视
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