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(2010·陕西西安五校高三二模)15.My pen friend and I keep in touch sending e-mails often. A.w

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(2010·陕西西安五校高三二模)15.My pen friend and I keep in touch sending e-mails often. A.w

(2010·陕西西安五校高三二模)15.My pen friend and I keep in touch ________ sending e-mails often.

A.with       B.by        C.on             D.of

试题答案

B