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Câu hỏi:
Find the mistake: Before the cotton gin A. had been invented in 1794, American famers B. had cheap C. salves remove seeds D. from the cotton fiber.
- A. had been invented
- B. had
- C. salves
- D. from
Lời giải tham khảo:
Đáp án đúng: A
Câu đề bài: Trước khi máy tia hột bông được sáng chế ra năm 1974, các nông dân Mĩ đã dùng sáp rẻ tiền để lấy hạt ra khỏi các sợi bông.
=> Trong câu có 2 mệnh đề thời gian trước sau (có từ Before), mệnh đề ngay sau before sẽ xảy ra trước, nên mệnh đề còn lại được chia lùi thì.
Thay bằng: was invented.
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