Question

Things will go worse, if the problem is _________ unsolved．

1. A.
   made
2. B.
   remained
3. C.
   stayed
4. D.
   left

Answer 1

D
made的意思是“使”，而left意为“留下，剩下”，所以left符合句子的情景; B、C项不接宾语补足语。