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

问题描述:

It is reported that the floods have left about _________ people homeless.
A. two thousandB. two-thousandsC. two thousandsD. two thousands of
答案:A
解释一下

A.two thousand
hundred / thousand / dozen 等数量的名词,当前面有具体的数字,做定语时.不能加S,
thousands of 这是词组,表示泛指:许多,无数;数以千计的……,成千上万的……