–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
C

試題分析：考查定語從句。句中先行詞為8 o’clock，在定語從句中作時間狀語，故用關(guān)系副詞when。句意：——昨晚他什么時候回來的？——8點鐘，當時我正在看一部電視紀錄片。故C正確。
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