-----Will Mr Black be here soon?
-----I'm not sure.Let's go and see ( )
A.when will the train arrive
B.when the train arrives
C.when the train arrived
D.the train when will arrive
-----Will Mr Black be here soon?
-----I'm not sure.Let's go and see ( )
A.when will the train arrive
B.when the train arrives
C.when the train arrived
D.the train when will arrive