This book will show you can be used in other contexts..

问题描述:

This book will show you can be used in other contexts..
A.how you have observed
B.what you have observed
C.that you have observed
D.how that you have observed 为什麽选B不选C啊?

这里是宾从,show后面是双宾语,而宾从中缺少宾语所以用what,而that用于定从