1．(2012·安徽)In order to find the missing child，villagers ________ all they can over the past five hours.
A．did B．do
C．had done D．have been doing
答案：D 句意：为了找到走失的孩子，村民们在过去的五个小时里一直在尽全力寻找。由时间状语over the past five hours可知，句子要用现在完成时或现在完成进行时。故只有D项符合题意。
2．(2012·湖南)—I remember you were a talented pianist at college. Can you play the piano for me?
—Sorry，I ________the piano for years.
A．don't play B．wasn't playing
C．haven't played D．hadn't played
答案：C 句意，——我记得你上大学时是位天才钢琴师，你能为我弹一下钢琴吗？——很抱歉，我已经多年没弹过了。根据答语可以看出，此处指近几年到现在一直没弹过钢琴，故用现在完成时。
