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when he was____the door

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when he was_____the door,he found his keys were nowhere. A。would open B.opened C.had opened D.was to open
when he was____the door
解题思路: 在语境中正确运用语态
解题过程:
When he was_____the door,he found his keys were nowhere.
A.would open B.opened C.had opened D.was to open
句意为:当他正要开门时,他发现钥匙不见了。A项是过去将来时,when从句部分不能使用将来时will或would;B项过去时,C项过去完成时,表示开完了门,那就不用找钥匙了。所以选择D项,be to do sth 要做某事,还没有开门,所以才找钥匙的。
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最终答案:略