问题
选择题
Do you know the boy _______ is singing in the classroom? [ ]
A. when
B. who
C. which
D. whom
答案
答案：B
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Do you know the boy _______ is singing in the classroom? [ ]
A. when
B. who
C. which
D. whom
答案：B
）与等物质的量的Br2发生加成反应 
）与NaOH乙醇溶液共热发生消去HCl分子的反应