There were 30 students in the class who _________ an exam when the bell went off.
Giải bởi Vietjack
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.
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