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    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 只有当交换生项目结束回来之后他才意识到他多么喜欢它．

    解答 答案是C．本题考查倒装；题干中是"Only+状语（从句）"放在句首，（主句）句中用倒装语序，因此排除B和D；A项是过去完成时，表示"过去的过去"，realize是在return之后，不能用过去完成时，故排除A选C．

    点评 本题考查倒装，要积累相关倒装的规则，分清完全倒装和部分倒装；最后结合语境判断．

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