It is essential that cancer is diagnosed and treated as early as possible in order to

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Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions.

It is essential that cancer is diagnosed and treated as early as possible in order to assure a successful cure

that

treated

to assure

Giải thích

Đáp án B.

Dùng sai cấu trúc với câu giả định với tính từ essential, vậy nên phải đổi is thành be hoặc should be.