Jack is smart a boy he can work out difficult maths problems quickly.
A. so; that
B. such; that
C. such; as
D. so; as
网友回答
(答案→)A. so; that
B. such; that
C. such; as
D. so; as
解析：本题的含义是杰克是一个如此聪明的男孩，以至于他能狗快速的解决数学难题，so后跟形容词+冠词+名词，和that搭配表示如此……以至于的意思，而such修饰名词，结构为such+冠词+形容词+名词，故本题选A。