Scientists think that there _____ life on Earth for millions of years.

A. has had B. have had

C. has been D. have been

 

C

【解析】

試題分析：句意:科學(xué)家們認(rèn)為生命在月球上存在已經(jīng)有幾百萬年了。There be 句型的現(xiàn)在完成時，因為有for millions of，故用has been.故選C。

考點：考查現(xiàn)在完成時。

 

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