（ ）A:When _____ the train _____ B:In half an hour.A.does;getB.is;arrivingC.will;reachD.does;arrive in

（ ）A:When _____ the train _____ B:In half an hour.A.does;getB.is;arrivingC.will;reachD.does;arrive in
（ ）A:When _____ the train _____ B:In half an hour.
A.does;get
B.is;arriving
C.will;reach
D.does;arrive in

（ ）A:When _____ the train _____ B:In half an hour.A.does;getB.is;arrivingC.will;reachD.does;arrive in
这个解题关键,就是答案“in half an hour”,用 in 引导时间来表示将来时.
所以,前面提问一定是将来时.
B 如果要正确,应该改成 is about to arrive,be about to do sth.表示将要做某事
C 是正确的.