My pen friend and I keep in touch sending e-mails often．A. withB. by C. onD. of

发布时间：2020-08-16 07:43:45

My pen friend and I keep in touch      sending e-mails often．
A. with
B. by
C. on
D. of

网友回答

A. with
(答案→)B. by
C. on
D. of
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