She sometimes uses WeChat __________my mobile phone, but only to contact her ...

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问题 She sometimes uses WeChat __________my mobile phone, but only to contact her mother.

选项 A.by

B.in

C.on

D.for

答案C

解析考查介词辨析。句意为“她有时候用我手机上的微信,但只和她的妈妈联系”。by“靠,用(方法;手段)”,in“用,以(语言、材料)”,on“在……上”,for“为,为了”。微信是手机上的软件,故选C。
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