A Wechat (微信) is an invention __________ can help people talk to friends, share  photo, ideas and feelings freely.
A．whichB．whoC．whoseD．/
A

試題分析：句意：微信是可以幫助人們和朋友自由地聊天，分享照片，想法和感覺。這是一個定語從句，先行詞是物invention，關系詞可以用which或者that，但是先行詞在從句做主語，that不可以省略。故選A。
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