21、When he ________ the door，he found his keys were nowhere．
A．would open B．opened C．had opened D．was to open
科目：高中英語 來源： 題型：
When he ________ the door，he found his keys were nowhere．
A．would open B．opened C．had opened D．was to open
科目：高中英語 來源：2013-2014學年高考二輪增分增值集訓：非謂語動詞英語試卷（解析版） 題型：單項填空
When he ________ the door，he found his keys were nowhere.
A．would open?? ????????????? B．opened
C．had opened?? ????????????? D．was to open
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