A Wechat (微信) is an invention        can help people talk to friends, share photos, ideas and feeling freely.

• A.which
• B.who
• C.whose
• D./

答案

正确答案：A

知识点：定语从句  

which can help people talk to friends, share photos, ideas and feeling freely是定语从句，修饰先行词invention，而先行词是物，关系代词用which或that。所以答案选A。

略

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