It is reported that the floods have left about ________ people homeless.

A.two thousand

B.two--thousands

C.two thousands

D.two thousands of

答案及解析： A

解析：

句意：据报道洪水已经使大约两千人无家可归。当dozen, score, hundred, thousand, million前有具体数字时，都要用单数形式。故A为正确答案。