We already have pencils, but we need two pens.
A. dozen of, doze
B. dozens of, dozens
C. dozens of, dozen
D. dozens of, dozen of
网友回答
A. dozen of, doze
B. dozens of, dozens
(答案→)C. dozens of, dozen
D. dozens of, dozen of
解析：当它与具体数字连用时，既不加复数词尾-s，也不后接介词of