I wrote to my parents once a week, I was too busy with my teaching work.A. itB. unlessC. w

发布时间：2020-08-14 23:22:08

I wrote to my parents once a week,     I was too busy with my teaching work.
A. it
B. unless
C. when
D. as

网友回答

A. it
(答案→)B. unless
C. when
D. as
解析： unless＝if...not。
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