Question

If Tom had known the plan for the trip, he ________ out alone.

1. A.
   would not have gone
2. B.
   wouldn't go
3. C.
   may go
4. D.
   should have gone

Answer 1

A
考查虚拟语气，从句与过去时态相反，主句应用would/should/could+have done形式，此题应用否定形式。