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问题: It was not until he locked the door____he realized he had left the keys inside the house.

It was not until he locked the door____he realized he had left the keys inside the house.
A,when B,that
C,where D,before

解答:

It is not until… that…这是一个强调结构
B
直到她锁上门才意识到要是落屋了。