单项选择题

The following words have derivational affixes except ______.

A. works
B. prewar
C. postwar
D. bloody

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单项选择题Morphemes, which are independent of other morphemes, have complete meanings in themselves and can be used as free grammatical units in sentences. The sentence gives the definition of ______.

A. morphemes
B. free morphemes
C. allomorphs
D. bound morphemes

单项选择题Which of the following statements are not correct______

A. A phoneme is the smallest unit of sound.
B. A grapheme is the smallest unit of writing.
C. A sememe is the smallest unit of meaning.
D. A morpheme is the smallest unit of a word.