单选题
18、______ a man does not have to work so hard as to impair his vigor, he is likely to find far more zest in his free time than an idle man could possibly find.
参考答案
C
题目详解：
解析：这儿是由provided引导的一个条件状语从句,可引导条件状语从句的还有unless，on condition (that) ，supposing。
单选题
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