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(yǔ)位于句首句子采用部分倒裝，根據(jù)句子意思看描述過(guò)去的事情應(yīng)用一般過(guò)去時(shí)態(tài)。句意：只有當(dāng)我到了美國(guó)我才意識(shí)到我多么想念我的父母。
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