Yesterday our chemistry teacher asked so difficult a question ________ it puzzled all of us.
问题描述：
Yesterday our chemistry teacher asked so difficult a question ________ it puzzled all of us.
应该填什么 为什么
答
填that
构成so…that句型,如此……以至于…….
昨天化学老师问了我们一个那么难的问题,以至于把我们所有人都难倒了.
一般是A is so+形容词+that从句,也可以是…so+形容词+冠词+名词+that从句.本句为后者.