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

发布时间：2020-08-17 12:27:49


. 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
B. unless
C. when
D. as
解析： unless＝if...not。
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