when he ( )the door ,he found his keys wewhen he ( )the door ,he found his keys were nowhere.A.would open B.opened C.had opened D.was to open答案是选D,但是A也表示过去完成时,为什么不选A?

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• when he ( )the door ,he found his keys wewhen he ( )the door ,he found his keys were nowhere.A.would open B.opened C.had opened D.was to open答案是选D,但是A也表示过去完成时,为什么不选A?
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