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Miss Smith and I keep in touch writing often. [ ] A.withB.on C.byD.from

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Miss Smith and I keep in touch writing often. [ ] A.withB.on C.byD.from

Miss Smith and I keep in touch ________ writing often.

[]

A.withB.onC.byD.from

试题答案

答案:C

解析:

by在此表示方式或手段。