.…………..has been a topic of continual geological research. A. How the continents were formed B. How did the continents form C. The continents formed D. If the continents were formed

.…………..has been a topic of continual geological research.

A. How the continents were formed  
B. How did the continents form
C. The continents formed       
D. If the continents were formed

Trả lời

Chọn A

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