题目内容

Since the earliest ancestors of the whales were land creatures. the question has arisen as to how____________.

提问人：ylm发布时间：2021-05-07

A. did the flipper adaptation of the whale originate.

B. was the flipper adaptation of the whale originated.

C. the flipper adaptation of the whale originated.

D. the flipper adaptation of the whale to originate.

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Since the earliest ancestors of the whales were land creatures. the question has arisen as to how____________.

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