[题目]There life on earth for many years.A.isB.areC.has beenD.have been 题目和参考答案——青夏教育精英家教网—

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【题目】There life on earth for many years.
A.is
B.are
C.has been
D.have been

【答案】C
【解析】句意：地球上有生物很多年了。life为不可数名词，动词用单数形式，现在完成时与时间状语“for……”连用。故选C。

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A. but R. and C. however

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