单项选择
( )1 . Linda was just going out shopping ________ the telephone rang.,
A. while B. when C. after D. because
( )2 . I met Mr. Green _____ I was walking across the bridge, but I didn’t say hello to him.
A. before B. after C. until D. while
( )3 When his mother got home, Jimmy ________ the toys together busily.
A. put B. was putting C. puts D. to put
