14．Only when he returned from the exchange program          how much he enjoyed it．（　�。�
A．had he realizedB．he realizedC．did he realizeD．he had realized

分析 只有當交換生項目結束回來之后他才意識到他多么喜歡它．

解答 答案是C．本題考查倒裝；題干中是"Only+狀語（從句）"放在句首，（主句）句中用倒裝語序，因此排除B和D；A項是過去完成時，表示"過去的過去"，realize是在return之后，不能用過去完成時，故排除A選C．

點評 本題考查倒裝，要積累相關倒裝的規(guī)則，分清完全倒裝和部分倒裝；最后結合語境判斷．

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