You should brush your teeth before ______ to bed.(A) going (B) you going (C) go (D)went答案是(A)请问为何用 going 不是 go to bed

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You should brush your teeth before ______ to bed.(A) going (B) you going (C) go (D)went答案是(A)请问为何用 going 不是 go to bed
You should brush your teeth before ______ to bed.
(A) going (B) you going (C) go (D)went
答案是(A)
请问为何用 going 不是 go to bed

You should brush your teeth before ______ to bed.(A) going (B) you going (C) go (D)went答案是(A)请问为何用 going 不是 go to bed
我来简单的说一下.
你应该刷牙在什么样的条件下.在上床之前.
before之前已经是一个完整的句子
B语义重复
C go 是动词 此处需要的是条件状语,需要动名词作状语 所以应该是going
D went 时态不对