Only since they gave up that good chance＿＿＿ to show their invention again.

A.have they had no chance

B.they have had no chance

C.they have no chance

D.have they no chance

Only since they gave up that good chance＿＿＿ to show their invention again.

1. A.
   have they had no chance
2. B.
   they have had no chance
3. C.
   they have no chance
4. D.
   have they no chance