When he the door, he found his keys were nowhere． A．would open B．opened C．had op

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

         A．would open            B．opened                   C．had opened           D．wasto open

3．

试题答案

【答案】

D

【解析】考查非谓语动词。动词不定时的用法。句意为：当他要打开门的时候,他发现他的钥匙不见了。动词不定时表示将要发生的动作。