问题
选择题
I wrote to my parents once a week,____ I was too busy with my teaching work.
A．it
B．unless
C．when
D．as
答案
B
unless＝if...not。
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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。