When he ______ the door, he found his keys were nowhere．
A．would open B．opened C．had opened D．was to open
3．D
考查非謂語動(dòng)詞。動(dòng)詞不定時(shí)的用法。句意為：當(dāng)他要打開門的時(shí)候,他發(fā)現(xiàn)他的鑰匙不見了。動(dòng)詞不定時(shí)表示將要發(fā)生的動(dòng)作。
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