A. He enquired why I had not sent my application to him.
B. He enquired why I did not send my application to him.
C. He enquired why had I not sent my application to him.
D. He enquired why did I not send my application to him.
A. He enquired why I had not sent my application to him.
B. He enquired why I did not send my application to him.
C. He enquired why had I not sent my application to him.
D. He enquired why did I not send my application to him.