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Câu hỏi:
By the end of the 20th century, scientists have discovered the cure for common cold.
- A. the end of
- B. 20th century
- C. have discovered
- D. for
Lời giải tham khảo:
Đáp án đúng: C
Đáp án C
have discovered ---> had been discovering
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CÂU HỎI KHÁC
- We are waiting for Mike for the last two hours, but he still hasnt arrived.
- By the time he left the office, he have attended three meetings.
- So far this weekend, the teachers are giving us a lot of homework every day.
- By the end of the 20th century, scientists have discovered the cure for common cold.
- When I arrived, they had waited for me. They were very angry with me.
