An idea suddenly came to J.K.Rolling ________ she could write a book about people living in the magic world

A. if              B. when              C. that                D. which

An idea suddenly came to J.K. Rolling ________ she could write a book about people living in the magic world.

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

An idea suddenly came to J.K. Rolling ________ she could write a book about people living in the magic world.

A. if                 B. when                   C. that              D. which  

 An idea suddenly came to J.K. Rolling ________ she could write a book about people living in the magic world.

A. if            B. when             C. that             D. which