敦煌曲子词
参考答案：敦煌曲子词指在敦煌发现的早期民间词。很多作品为歌伎所作，内容多涉及男女之情。风格朴素，富于生活气息。
Often, when he _________ something that ___________ him, he wasted his time drawing some little
pictures. [ ]
A. should be doing; gave
B. should have been doing; was given
C. should do; was given
D. should have been doing; had given
供电企业需对客户非因故停止供电时，在停电前（），将停电时间再通知客户1次，方可在通知规定时间实施停电。
A.15min；
B.30min；
C.45min；
D.60min。
