400-600-1123
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答案：
E
平行结构
A
and 连接平行结构，但是try 和 establish概念不对等，try尝试做某事，但是没有表达要做什么，语义上来讲establish是尝试干的事情，try to establish ；to establish与to encourage，达到结构平行，
B establish…… and encouraging无法达到结构平行，able to be done用法错误；
C establishing …… and to encourage结构不平行；
Dto establish …… and encouraging 结构不平行 
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