Question

He _________ in another way after he worked out the problem in this way．

1. A.
   tried doing it
2. B.
   tried to do it
3. C.
   tries doing
4. D.
   tried doing

Answer 1

A
从状语从句看出已经用这种方法解决了这个问题，接下来是试着用另一种方法解决这个问题。try doing试着做，try to do努力干，D项缺少it，故排除。