When he ________ the door, he found his keys were nowhere.

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问题 When he ________ the door, he found his keys were nowhere.

选项 A、would open
B、opened
C、had opened
D、was to open

答案D

解析考查非谓语动词中动词不定式的用法。主句是过去时，所以从句应该是过去将来时，谓语是was to do形式。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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