Jim was late for two classes this morning. He said that he forgot both of the .
A. rooms’ number
B. room number
C. room’s numbers
D. room numbers
网友回答
A. rooms’ number
B. room number
C. room’s numbers
(答案→)D. room numbers
解析：考查名词作定语的用法。room 为无生命名词，不用 room’s 这样的所有格形式，在此可直接用名词作定语，后面有both因此number勇复数。