题目内容：

This is _____difficult problem______my brother can't work it out.
A.so,that B.such,that C.so a,that D.such a,that

优质解答

D
such( a/an) +形容词difficult +名词problem + that 的结构
翻译； 这是个如此困难的问题以至于我哥哥解答不出来
如果用：so + 形容词/副词 + that..