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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.
Students are not allowed to handle these chemicals if they are under the supervision of a teacher.
- A. are
- B. these
- C. if
- D. of
trả lời câu hỏi trước khi xem đáp án bên dướiYOMEDIACâu 1 Đáp án đúng: C
Đáp án C: if ⇒ unless
Giải thích: Các học sinh không được động vào các hóa chất trừ khi dưới sự kiểm soát của giáo viên (không phải là "nếu", mà là "trừ khi") -> sửa thành: unless.
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