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When he       the door,he found his keys were

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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
我选的C,很不理解……求解释,
When he       the door,he found his keys were
e to do
表示正要做某事
当他正要去开门的时候,发现钥匙不见了.
再问: 那么B、C都错在哪儿了呢?
再答: B用的过去式,“当他开门的时候(注意,不是要开门,而是正开门的时候),找不到钥匙了” C用的过去完成时,“当他已经开门的时候,找不到钥匙了” 逻辑上都说不通