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
网友回答
(答案→)A. Left wondering
B. Having left wondering
C. Leaving to wonder
D. Having left to wonder
解析：
试题分析:考查非谓语动词。由句子结构可知 what would happen在句中做状语，动词leave和句子主语none of them 是被动关系，表示“使人处于某一状态或保持某一动作”，而leaving 和having done是现在分词的主动形式，由此可知B、C、D选项错误。故正确答案是A。句意：只剩下他们在疑惑会有什么情况发生，可是谁也不能够理出头绪来。