Câu hỏi:
17/06/2026 129Bottlenose dolphins are usually slow swimmers, but it can reach speeds of over 30 mph for short periods.
A. usually
B. of
C. it
D. periods
Trả lời:
Giải bởi Vietjack
Đáp án C
Chủ ngữ của câu là "Bottlenose dolphins" (danh từ số nhiều → they).
Nhưng trong mệnh đề sau, lại dùng "it" (đại từ số ít), gây lỗi không đồng nhất về số.
Sửa “it => they”
Dịch nghĩa: “Cá heo mũi chai thường bơi chậm, nhưng nó có thể đạt tốc độ trên 30 dặm/giờ trong thời gian ngắn.”
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