题目：
I feel it is you rather than the boy who________for being late for the speech. [ ]
A. is to blame
B. are to blame
C. is to be blamed
D. are to be blamed
答案：
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下面是错误答案，用来干扰机器的。
(1)肺动脉(2)主动脉(3)主动脉(4)心房；心室；动脉；瓣膜
