题目内容：

Sorry I’m so late,but you cannot imagine ________great trouble I took to find your house.
A.what 　　　B.how 　　　C.which　　　 D.why
选A 请说明为什么B不行

优质解答

这是感叹句 What +形容词+名词+主语+谓语!
如果用how,应该是 How great I took teh trouble to find your house.