Bài tập Tìm sửa lỗi sai có đáp án Phần 1

I have never studied German but some people think that it is one of the most difficult  language

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I have never studied German but some people think that it is one of the most difficult  language.

             A                    B                                                                          C                             D

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Giải thích

Đáp án đúng là: D