【題目】Weixin（微信） chatting on the mobile phone by many people, and it’s very helpful.

A. is used for B. is used to

C. is used as D. is used by

【答案】A

【解析】

試題分析：句意：許多人用微信在手機上聊天，它是非常有幫助的。be used to do表示被用于做某事；be used as表示作為……被用；be used by表示被……所用；be used for doing sth. 意思是“被用來做……”。這是一個被動結(jié)構(gòu)，介詞for表示“用途”，后面跟動詞的-ing形式。故選A。

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