问题
选择题
When he ______ the door, he found his keys were nowhere．
A．would open
B．opened
C．had opened
D．was to open
答案
3．D
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。
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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。