Bộ câu hỏi: Mệnh đề quan hệ và rút gọn mệnh đề quan hệ (có đáp án)
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My mother was disappointed after buying a smartphone ______ on Facebook.

6/54

My mother was disappointed after buying a smartphone ______ on Facebook.

advertised

advertising

to advertise

which are advertised

Giải thích

Chọn A