6. We should believe what Jim is telling us. If there ____morning, the postman could have begun his round later or the postal van could have broken down again.
A.would have been
B. was
C. had been
D. were
7. Her unexpected arrival probably saved his life. Ten minutes later the fire _____impossible to control.
A. had been
B. might be
C. must have been
D. would have been they
8. The base can only be supplied through light biplanes carrying up to a to of cargo. An aircraft that_____ large enough to carry ten tons would need a much longer runway.
A. would have been
B. has been
C. would be
D. is
9. It's not difficult to imagine how Dave would react if one of his partners____ with bankruptcy.
A. were threaten
B. were threatened
C. threatened
D. threate​