(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．with B．by C．on D．of
试题答案
B
（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
B