What the element"-es" indicates is third person singular, present tense, the element"-ed" past tense, and "-ing" progressive aspect. Since they are the smallest unit of language and meaningful, they are alse ______ . ()

What the element"-es" indicates is third person singular, present tense, the element"-ed" past tense, and "-ing" progressive aspect. Since they are the smallest unit of language and meaningful, they are alse ______ . ()

A.phonemes

B.morphemes

C.allophones

D.phones

正确答案是B