题目内容

Only when I left for America ____________ how much I missed my parents.
A．I realizedB．did I realizeC．I had realizedD．had I realized
B
only+状语位于句首句子采用部分倒装，根据句子意思看描述过去的事情应用一般过去时态。句意：只有当我到了美国我才意识到我多么想念我的父母。
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