It is only when you nearly lose someone _____ fully conscious of how much you value him.

A. do you become                                                            B. then you become

C. have you become                                                D. that you become

 It is only when you nearly lose someone _______ fully conscious of how much you value him.

A. do you become           B. then you become 

C. that you become         D. have you become

It is only when you nearly lose someone ________ you become fully conscious of how much you value them．

1. A.
   which
2. B.
   when
3. C.
   that
4. D.
   who