Question

 —There are ______ such books here.

—I only need ______ these books on this shelf.

A. eight dozens; one dozen                             B. eight dozens of; one dozen of

C. eight dozen; one dozen                               D. dozens of; one dozen of

Answer

 D

dozen被数词或many ,several 等修饰时，不加s，后面也不用 of 。如： two / many /several dozen pencils。但如果 dozen后有 these, those, them, us等词时 dozen后要接of 。如： two dozen of us,  three dozen of these eggs。故答案为D。