a.

1. 困惑的，茫然不知所措的[（+at/about/by/over）][+to-v]
   We were perplexed at her interest in legal matters.

   我们对她在法律问题上的兴趣感到迷惑不解。

2. 复杂的，纠缠不清的
   Mary didn't want to get involved in any perplexed relationship with a married man.

   玛丽不愿扯入与已婚男人纠缠不清的关系中。