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When he ________ the door,he found his keys were nowhere.
A.would openB.opened
C.had openedD.was to open
D
考查非谓语动词。动词不定式的用法。句意:当他要打开门的时候,他发现他的钥匙不见了。动词不定式表示将要发生的动作。
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