She went to the bookstore and bought ___.A,dozen books B,dozens of books

问题描述:

She went to the bookstore and bought ___.A,dozen books B,dozens of books

B
她去书店买了许多书.
dozens of 数十,许多选A 为什么不行?dozens of 是固定短语。a dozen 表示 一打,十二 ,去掉a 句意就不完整了。不能直接说 dozen books 吗?不能说。dozens ofbooks 才表示许多书。