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(dāng)我離開(kāi)家去上大學(xué)，我才意識(shí)到媽媽為我做了多少事情。這句話用only+時(shí)間狀語(yǔ)從句，放在句首，后面的主句用部分倒裝，助動(dòng)詞提前，因?yàn)閞ealize這個(gè)動(dòng)作，就是發(fā)生在when I left home to go to college，所以用一般過(guò)去時(shí)，所以選A。
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