题目内容
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
答案:C
提示:
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。 |
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