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–When did he come back last night? --It was at 8 o’clock I was watching a docume

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–When did he come back last night? --It was at 8 o’clock I was watching a docume

–When did he come back last night?

--It was at 8 o’clock ________ I was watching a documentary on TV.

A.sinceB.thatC.whenD.which

试题答案

C

解析试题