The thief glanced about now and then ________ he knew he was being followed.

A．even if 　　　　 B．as if　　　　　 C．in case 　　　D．so that

The thief glanced about now and then ______ he knew he was being followed.

A．even if             B．as though         C．in case             D．so that

The thief glanced about now and then ________ he knew he was being followed．

1. A.
   even if
2. B.
   as though
3. C.
   in case
4. D.
   so that