题目内容：

when he ( )the door ,he found his keys were nowhere.
A.would open B.opened C.had opened D.was to open
为什么答案选D,为什么不选B,在时间状语从句中,不是可以用过去时表过去将来时吗

优质解答

B因为主句he found his keys were nowhere说发现不找钥匙在哪里了,因此他不可能开门,因此不能选b opened
只能选 D be to open 将要去开门