I am sorry,i forget to tell you----.

题目

I am sorry,i forget to tell you----.
a what to do it b what to do c how to do d which to do it

答案

选择B
因为I am sorry,i forget to tell you----.是宾语从句所以后面用陈述语序.
what后面应该直接加to do,因为它已经是个主语了.
how后面应该是 to do it,它没有主语所以用 it,