问题补充：
We all think it is Jack as well as his wife that for their son’s bad manners in public.
A. are to blame
B. is to be blamed
C. are to be blamed
D. is to blame
答案：
A. are to blame
B. is to be blamed
C. are to be blamed
(答案→)D. is to blame
解析：考查主谓一致。as well as连接两个主语，谓语动词与第一个主语保持一致；be to blame应当受到责备，选D。
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