精品一区二区免费在线观看_国产精品久久久久久av福利软件_97成人精品区在线播放_国内成人精品一区

Tom’s mother kept telling him that he should work hard ,but _____ didn’ t help   
      A.this         B.which           C.any          D.it

Tom's mother kept telling him that he should work hard, but ________ didn't help.

[　　]

Tom's mother kept telling him that he should work hard, but ________ didn't help.

[　　]