What the element ' es’indicates is third person singular, presen

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 ______.
A、phonemes
B、morphemes
C、allophones
D、phones
【正确答案】：B
【题目解析】：A morpheme is the smallest meaningful linguistic unit that cannot be further segmented.词素是不能够被进一步分割的最小语言单位。