I don't know（ ）a whom to go there Bwhat I did Cwhat did I do Dwhere did IAwhom to go there Bwhat I did Cwhat did I do Dwhere did I

I don't know（ ）a whom to go there Bwhat I did Cwhat did I do Dwhere did I
Awhom to go there Bwhat I did Cwhat did I do Dwhere did I

选B.
后面是一个从句.表示i did what.