Before_______to bed.I usually do some reading.A.going B.go请问要选哪个?答案不重要,主要的是“正确”的讲解,

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Before_______to bed.I usually do some reading.
A.going B.go请问要选哪个?答案不重要,主要的是“正确”的讲解,

A.going
before +doing表时间点

a, before连词或介词,此处是介词,后用doing.

before +doing

before +doing,逗号前句子做状语