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They are the scientists who have been known in this region of the earth． [ ] A．

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They are the scientists who have been known in this region of the earth． [ ] A．

They are the scientists who have been known ________ in this region of the earth．

[]A．

explored

B．

to be explored

C．

to explore

D．

explore

试题答案

答案：C

提示：

本题是一个复合句，定语从句中谓语动词have been known后面可跟不定式或形容词作补语。

标签：havewhoknownbeenare

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