Where you left your bag yesterday?

Options

A. No substitution
B. Where did you left
C. Where were you leaving
D. Where did you leave

Answer

D

Explanation

Where you left should be replaced with Where did you leave.. The auxiliary verb .did. should be used after .where because the verb is placed after the subject in an interrogative sentence in which a question is asked) and with did., V, is to be used i.e. leave.