The problem will not be difficult to solve, if properly .
A. to be handled
B. handling
C. handled
D. being handled
网友回答
A. to be handled
B. handling
(答案→)C. handled
D. being handled
解析：考查状语从句的省略句：句意：如果处理得当，这个问题解决起来不难。If properly handled=if the problem is properly handled，当主从句的主语一致的时候，可以省略状语从句的主语和be动词，选C。