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Câu hỏi:
There were 30 students in the class who _________ an exam when the bell went off.
- A. was taking
- B. were taking
- C. had been taking
- D. has been taking
Lời giải tham khảo:
Đáp án đúng: B
Kiến thức: Thì quá khứ tiếp diễn
Giải thích:
Thì quá khứ tiếp diễn dùng để diễn tả một hành động đang xảy ra tại một thời điểm trong quá khứ (chia quá khứ tiếp diễn), nếu có hành động khác xen vào thì hành động đó chia ở quá khứ đơn.
Công thức: S + was/were Ving. => loại C, D
Đại từ QH “who” thay cho danh từ số nhiều “30 students” (30 học sinh) => tobe ở dạng số nhiều => loại A
Tạm dịch: Có 30 học sinh trong lớp đang làm bài thi thì chuông báo hết giờ.
Chọn B
Câu hỏi này thuộc đề thi trắc nghiệm dưới đây, bấm vào Bắt đầu thi để làm toàn bài
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