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【单选题】
化合物丙可由如下反应得到： 丙的结构不可能是（　　）
A.
CH 3 CBr 2 CH 2 CH 3
B.
（CH 3 ） 2 CBrCH 2 Br
C.
C 2 H 5 CHBrCH 2 Br
D.
CH 3 （CHBr） 2 CH 3
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