455.When ________ the next train leave for Boston,please?
Usually at 13:15,but because of a small accident on the line,it ______ at 13:45.
A.does;is going to start
B.will;starts
C.does;will start
D.will;is to start
456.My toothache is killing me.I ________ it ______ away.But now it's getting worse and worse.
A.think;is going
B.thought;was going
C.have thought;is going
D.had thought;had gone
455.答案是C:第一空为火车时刻表，故用一般现在时;第二空表示将来。
456.答案是B:考查动词的时态在具体语境中的应用。句意:我原先以为牙疼会缓解的。
