Monomorphemic words are realized by single morphs such as （ ）.

Monomorphemic words are realized by single morphs such as （ ）.
A、boss
B、cats
C、feet
D、trying
【正确答案】：A
【题目解析】：单语素词是由单一语素实现的，如boss。而cats是由cat+s形成的；feet是由foot变为复数得来的；trying是由try+ing得来的。