_____ soldiers and doctors have been in Wenchuan to help the people there.
A.Thousand of
B.Two thousands
C.Thousands of
D.Many thousands of
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C解析本题考查数词。数词hundred, thousand, million等后面跟of 时，要变复数。排除A。thousand前接具体数字时，后面不能跟of,也不用复数形式，排除B。前面没有数字，thousand用复数，且其后用of。Many thousands of后接名词时，名词前要加the或物主代词。