17000 bài tập tách từ đề thi thử môn Tiếng Anh có đáp án (Phần 3)

Although he to Mark Twain, I think his books are unique.

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Although he _____________ to Mark Twain, I think his books are unique.

often has been compared

has often compared

has often been compared

has been often comparing

Giải thích

Chọn C