Scientists think that there life on Earth for millions of years.A. has had B. have hadC. has been D. have been 题目和参考答案——青夏教育精英家教网—

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

A. has had B. have had

C. has been D. have been

【解析】

试题分析：句意:科学家们认为生命在月球上存在已经有几百万年了。There be 句型的现在完成时，因为有for millions of，故用has been.故选C。

考点：考查现在完成时。

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