单项填空
从A、B、C、D四个选项中，选出可以填入空白处的最佳选项,并在答题卡上将该项涂黑。
例：It is generally considered unwise to give a child he or she wants .
A．however B．whatever C．whichever D．wheneve r
答案是B.
21．-Can I speak to Mr. Wang , please ?
-A．Who are you ? B．I'm Wang . C．Speaking D．Are you john ?
22．No one helped me . I did it all myself .
A．for B．by C．from D．to
23．Mary wrote an article on the team had failed to win the game .
A．why B．what C．who D．that
