I wrote to my parents once a week, I was too busy with my teaching work.A．itB．unlessC．whenD．as 题目和参考答案——青夏教育精英家教网——

题目内容

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

A．it

B．unless

C．when

D．as

B

unless＝if...not。

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