Sorry I’m so late,but you cannot imagine ________great trouble I took to find your house.

问题描述:

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

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.