摘要： a piece of music / pieces of music

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He could hum songs and difficult______

A.
piece of musics
B.
pieces of musics
C.
piece of music
D.
pieces of music

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There are ten ________ in the CD.

A. piece of music
B. music
C. pieces of music

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Kate could hum songs and difficult _______ .

A.  piece of musics
B.  pieces of musics
C.  piece of music
D.  pieces of music

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He could hum songs and difficult______.

A.  piece of musics
B.  pieces of music
C.  pieces of musics
D.  music

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He could hum songs and difficult______

A. piece of musics B. pieces of musics

C. piece of music D. pieces of music

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