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.
One necessary (A) preventive measure (B) to be taken (C) is that the public should be on the outlook (D) for symptoms of the disease.
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.
One necessary (A) preventive measure (B) to be taken (C) is that the public should be on the outlook (D) for symptoms of the disease.
One necessary (A) preventive measure (B) to be taken (C) is that the public should be on the outlook (D) for symptoms of the disease.
Chọn một phương án bên dưới để kiểm tra đáp án ngay:
Đáp án chính thức: D
Hướng dẫn giải chi tiết
The correct phrase is 'on the lookout'.