The thought ______ he might fail in the exam worried him a lot.

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

The thought ______ he might fail in the exam worried him a lot.

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

The thought ______ he might fail in the exam worried him a lot.

The thought _____ he might fail in the exam worried him．　　　

[　　]

A．which　　　B．that　　　C．when　　　D．what

�. The thought worried him much ________ he might fail in the exam.

    A) that            B) which          C) when         D) so that