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Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.
_____ at the Isthmus of Panama, so animals were able to migrate between North and South Ameria .
- A. When a land bridge existed
- B. A land bridge existed
- C. A land bridge
- D. With a land bridge
trả lời câu hỏi trước khi xem đáp án bên dướiYOMEDIACâu 1 Đáp án đúng: B
Đáp án đúng là B.
Ta thấy trong câu có liên từ "so" dùng để nối 2 mệnh đề chỉ nguyên nhân - kết quả. Do đó chọn đáp áp B: "A land bridge existed" là hợp lí nhất.
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