When he  _______ the door, he found his keys were nowhere.            
A．would open B．opened C．had opened D．was to open
D
考查動詞時態(tài)的用法。句意為：當他要打開門的時候,他發(fā)現(xiàn)他的鑰匙不見了。動詞不定時表示將要發(fā)生的動作。
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