Nowadays _____ students go abroad for further study every year

问题描述:

Nowadays _____ students go abroad for further study every year
A.three thousand
B.three thousands
C.thousands of
D.three thousands of
选哪个?为什么?

选 C,现在,每年成千上万的学生出国继续深造.
thousands of+n 是固定用法,表示成千上万的,数以万计的.