—— This is one of the oldest trees in the world. such a big tree.A. Never I have seenB. I

问题补充：

—— This is one of the oldest trees in the world.

such a big tree.

A. Never I have seen

B. I haven never seen

C. Never have I seen

D. I have seen never

答案：

A. Never I have seen

B. I haven never seen

(答案→)C. Never have I seen

D. I have seen never

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