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Only when I left home to go to college ___ how much my mother had done for me.
A．did I realizeB．I realizedC．had I realizedD．I had realized
A

試題分析：句意：只有當我離開家去上大學，我才意識到媽媽為我做了多少事情。這句話用only+時間狀語從句，放在句首，后面的主句用部分倒裝，助動詞提前，因為realize這個動作，就是發(fā)生在when I left home to go to college，所以用一般過去時，所以選A。
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