______the doors were closed and that all the lights were off, the boy left the classroom

1. A.
   Check
2. B.
   To check
3. C.
   Checked
4. D.
   Having checked

______the doors were closed and that all the lights were off, the boy left the classroom.

 ______the doors were closed and that all the lights were off, the boy left the classroom.

A . Check  B. To check  C. Checked  D. Having checked

 ______the doors were closed and that all the lights were off, the boy left the classroom.

A . Check  B. To check  C. Checked  D. Having checked

______the doors were closed and that all the lights were off, the boy left the classroom.