Question

I really don't know _. A.what should i do B.what to do.

Answer 1

这道题应该选择的是B
解析：A应该用陈述句语序，若改为what
I
should
do就对了，B是正确答案，属于省略句式，原句应该是what
to
do
（with
it）。
楼主满意的话希望采纳一下，谢谢。

Answer 2

I
really
don't
know
后面可以跟
what
I
should
do
或者
what
to
do.
所以选择B.
答案A是错误的.
望楼主采纳:-)