Câu hỏi:
18/03/2020 16,139Before the cotton gin A. had been invented in 1794, American famers B. had cheap C. salves remove seeds D. from the cotton fiber.
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Trả lời:
Chọn 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.
CÂU HỎI HOT CÙNG CHỦ ĐỀ
Câu 1:
* Mark the letter A, B, C, or D on you answer sheet to indicate the word that differs from the rest in the position of the main stress in each of the following questions.
The A.I. expert wanted to have his assistant _______ the newly made robot.
Câu 2:
* Mark the letter A, B, C, or D on you answer sheet to indicate the word that differs from the rest in the position of the main stress in each of the following questions.
Emma and Karen used to be ______ good friends that I’m surprised they don’t get on now.
Câu 3:
* Mark the letter A, B, C, or D on you answer sheet to indicate the word that differs from the rest in the position of the main stress in each of the following questions.
We are all very sorry that we have to wait for this agreement to come into_________.
Câu 4:
* Mark the letter A, B, C, or D on your answer sheet to indicate the most suitable response to complete each of the following exchanges.
He was so addicted to social networks that he quitted all other outdoor activities.
Câu 5:
* Mark the letter A, B, C, or D on your answer sheet to indicate the most suitable response to complete each of the following exchanges.
Immediately after his arrival home a water-heater exploded.
Câu 6:
* Mark the letter A, B, C, or D on your answer sheet to indicate the most suitable response to complete each of the following exchanges.
“Do you fancy a drink?” –“___________”
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