Question

I supported him in time , otherwise he ______ off the bike .

1. A.
   might fall
2. B.
   would fall
3. C.
   should have fallen
4. D.
   would have fallen

Answer 1

D
otherwise 否则，相当于if not。本句可改为： if I hadn’t supported him in time, he ___off the bike。显然，这是与过去事实相反，主句应用would/could…+have done。故选D。