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would do 和was to open when he ____ the door,he found his key

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would do 和was to open when he ____ the door,he found his keys were nowhere.A.to,by B.
when he ____ the door,he found his keys were nowhere.A.to,by B.by,to C.had opened D.was to
.将要开的时候,但是would open 是will open的过去式,虽然常用作过去常常的意思,但是也是will do的过去式啊~也可以理解过过去要开门的时候啊,怎么A错了,错哪里了
只有D是对的,意思是:当他马上(就要)去开门时,他发现找不到钥匙.填would open也表示表示“当他将要开门时…”,但是,be about to do ,表示即刻或马上就发生的动作,will (would )表示的动作远比be about to do 慢的多,表示将来的动作但是更可能过去经常 的或通常的动作.所以,按照正常逻辑,只有选择D是正确的.(我是宋ocean )