问题描述：
Some people like to work_,for they think that a background noise may help them to concentrate on the
ir work.A.while the radio being on
B.while the radio on
C.while the radio turning on
D.being on the radio
ir work.A.while the radio being on
B.while the radio on
C.while the radio turning on
D.being on the radio
问题解答：
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