问题补充：
We all feel it is Jack as well as his wife thatfor their son’s bad performance at school.
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。作主语的是Jack，所以用单数，be to blame for是固定短语，意思是“应对……负责”。
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