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+狀語位于句首句子采用部分倒裝，根據(jù)句子意思看描述過去的事情應用一般過去時態(tài)。句意：只有當我到了美國我才意識到我多么想念我的父母。
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