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Câu hỏi:
Students are not allowed to handle these chemicals unless they _________ under the supervision of a teacher.
- A. are
- B. were
- C. have been
- D. had been
Lời giải tham khảo:
Đáp án đúng: A
Đáp án A
Kiến thức về câu điều kiện
Căn cứ vào thì hiện tại đơn trong mệnh đề chính đang chia “are not allowed” nên ta suy ra đây là câu điều kiện loại 1.
=> chọn được phương án A
Tạm dịch: Học sinh không được phép xử lý các hóa chất này, nếu không có sự giám sát của giáo viên.
Cấu trúc khác cần lưu ý:
Allow/permit sb to do st = let sb do st: cho phép ai làm gì
Allow/permit doing st: cho phép làm gì
Be allowed/permitted to do st: được phép làm gì
Be under the supervision of sb: dưới sự giám sát của ai
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