It was already ten o’clock __he got back home.Awhile B when C if _英语解答

It was already ten o’clock __he got back home.Awhile B when C if D because

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解答

同学,
选B,when引导时间状语从句表示主句动作已发生.while引导时间状语从句表示主句动作正在进行.