My pen friend and I keep in touch ________ sending e-mails often.A.withB.by C.onD.of-高三英语

题目简介

My pen friend and I keep in touch ________ sending e-mails often.A.withB.by C.onD.of-高三英语

题目详情

My pen friend and I keep in touch ________ sending e-mails often.
A.withB.by C.onD.of
题型:单选题难度:偏易来源:不详

答案

B

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