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Câu hỏi:
Choose the part among A, B, C or D that needs correcting: She couldn’t find out (A) the (B) solution unless she didn’t understand (C) the (D) problem.
- A. find out
- B. the (1)
- C. didn’t understand
- D. the (2)
Lời giải tham khảo:
Đáp án đúng: C
Trong câu điều kiện vế có chứa unless thì động từ không chia ở dạng phủ định.
didn’t understand ⇒ understood
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