The man didn’t know ________ the thief broke into the house and stole all his valuable things．

1. A.
   it was when that
2. B.
   when it was that
3. C.
   that it was when
4. D.
   was it when that．

 The man didn’t know _________ the thief broke into the house and stole all his valuable things  

A. it was when that          B. when it was that   C. that it was when      D. was it when that