Question

【题目】A Wechat (微信) is an invention _____ can help people talk to friends, share photos, ideas and feeling freely.
A.which
B.who
C./

Answer 1

【答案】A
【解析】句意：微信是一个能帮助人们自由地与朋友交谈、分享照片、观点和情感的发明。这是一个定语从句，先行词invention指物，所以用which或that，关系代词在从句中作主语，不可省略，所以答案是A。