he is worried that won't pass the exam 【改为同义词】he worried ----- ------- the exam.

问题描述:

he is worried that won't pass the exam 【改为同义词】he worried ----- ------- the exam.

about passing

he is worried that he would fail the exam

about failing/passing这两个都具有同样意义
不过failing,担心考砸
passing,担心不过关