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Câu hỏi:
Only after the teacher had explained the procedure clearly___________to go ahead with the experiment.
- A. the students were allowed
- B. were the students allowed
- C. the students allowed
- D. did the students allow
Lời giải tham khảo:
Đáp án đúng: B
Đáp án B - câu hỏi đảo ngữ
“Only + liên từ + mệnh đề” đứng đầu câu là dấu hiệu của đảo ngữ trợ động từ lên trước chủ ngữ, vì thế nên, hai đáp án A và C bị loại do không có đảo ngữ.
Động từ “allow” (cho phép) là ngoại động từ, sau nó phải có sb/sth (tân ngữ), nhưng trong câu này không có, nên phải để ở dạng bị động (be + P2). Vậy nên, ta chọn đáp án có bị động và đảo ngữ là đáp án B.
Tạm dịch: Chỉ sau khi thầy giáo giải thích quy trình một cách cặn kẽ thì sinh viên mới được phép thực hiện thí nghiệm.
Kiến thức mở rộng: Ngoài trường hợp “only + liên từ + mệnh đề” thì ta còn có “only + giới từ + Noun/ V-ing” cũng là dấu hiệu của đảo ngữ; ví dụ: Only on Sunday do we have a day off (Chỉ vào ngày Chủ nhật chúng tôi mới được nghỉ).
Câu hỏi này thuộc đề thi trắc nghiệm dưới đây, bấm vào Bắt đầu thi để làm toàn bài
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