题目

The train has gone. You two _________on time. A. should come                       B. must have come C. ought to have come           D. shouldn’t have come   答案：Cought to have done sth.  “本来应该做而事实上没有做某事”。 由题意可知C项正确。  The steel plant with a population of 4000 is ________ in the country．A.second largeB.a second largestC.the second largerD.the second largest