So student that he can work out all difficult problems.
A. clever a ; was he
B. a clever; was he
C. clever a , he was
D. a clever, he was
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(答案→)A. clever a ; was he
B. a clever; was he
C. clever a , he was
D. a clever, he was
解析：考查倒装。So … that…如此…… 以致……结构为so + adj + a/an + n + that，so放在句首，主句的主谓要倒装。故选A。