939.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
D.will;is to start
940.My toothache is killing me.I ________ it ______ away.But now it's getting worse and worse.
C.have thought;is going
D.had thought;had gone