The boy is ________ see the teacher because he ________ a mistake.
A:afraid of; has
B:afraid to; has made
C:afraid to; make
D:afraid of; made
用下列哪种方法可以更好的除去因装修产生的大量有害气体( )
欧洲杯足球赛分为小组赛和淘汰赛两个阶段.