— Will Mr. Black be here soon?
— I’m not sure. Let’s go and see         .

— 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 will arrive

C．when the train will arrive at

D．when will the train arrive at

— Will Mr. Black be here soon?
— I’m not sure. Let’s go and see         .

1. A.
   when will the train arrive
2. B.
   when the train will arrive
3. C.
   when the train will arrive at
4. D.
   when will the train arrive at

-Will Mr Black be here soon?

-I’m not sure, let’s go and see ________．

1. A.
   when will the train arrive
2. B.
   when the train arrives
3. C.
   when the train arrived
4. D.
   the train when will arrive