You must do ____ is best for you.

You must do ____ is best for you.

A.everything

B.all

C.whatever

D.the things

答案及解析： C

解析：

Whatever在此作宾语从句中的主语，意为“任何（一切）事（东西）（意思接近anything that）”又如：Whatever I have is at your service（我的一切东西随你使用。）