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He is good-tempered-he never _____ his voice to his kids.

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He is good-tempered-he never _____ his voice to his kids.
A.rises B.increases
C.raises D.heightens
如果错了,为什么?
He is good-tempered-he never _____ his voice to his kids.
选C,
raise one's voice,ie speak more loudly 提高嗓门
heighten也有(使某事物)提高、加强的意思,但它侧重于高度的增加以及情况的紧张,即cause sth to become higher or more intense