找考题网-背景图
单项选择题

A.active rootB.fixed rootC.non-free rootD.bound rootNat……

"Nation” as a free root can function alone in a sentence while "diet" is a ______, which can not function alone grammatically and has to combine with other morphemes to create new words.

A.active root
B.fixed root
C.non-free root
D.bound root