【題目】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為不可數(shù)名詞，動(dòng)詞用單數(shù)形式，現(xiàn)在完成時(shí)與時(shí)間狀語(yǔ)“for……”連用。故選C。

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