题目内容
【题目】I don't know when heback. Please tell me when heback.
A.comes, comes
B.comes, will come
C. will come, comes
【答案】C
【解析】句意：我不知道他什么时候回来．当他回来时，请告诉我。第一空，根据句意可知，表示将来某一时刻的动作或状态，应该用一般将来时态will come；第二空，根据句意可知when引导时间状语从句，从句中用一般现在时表示将来，用一般现在时态，主语是he，谓语用第三人称单数comes．所以选C
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