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Scientists think that there has been life on Earth for _______ years.       
A. millions     
 B. millions of
C. million of
D. million
B

試題分析:此題重點考查數詞的表達法,如果有確切的數字 thousand 或million后面直接跟名詞,thousand 和million等不用復數,也不用of,而thousands of,millions of直接跟名詞或代詞,前面不用確切的數字表示約數,根據題意故選B
點評:正確區分是確切數還是不確切數,二者不能混淆,關鍵是thousand和million加不加s。
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