_______ what would happen, none of them could find a way out

_______ what would happen, none of them could find a way out

A.Left wondering

B.Having left wondering

C.Leaving to wonder

D.Having left to wonder

答案及解析： A

解析：

考查非谓语动词。句意“留待观察会发生什么事情，他们中没有一个能找到出路。”逻辑主语是them，them和leave之间是被动关系，应该用过去分词。leave和find是同时发生的，排除B、D。故选A。