问题
选择题
He is welcome to come along, he behaves himself.
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答案
A
考查状语从句。句意: 只要他守规矩就欢迎他来。此处provided(that)相当于if, 引导一个条件状语从句。so far as在……范围之内; even if即使, 引导让步状语从句; in case以防, 引导目的状语从句。
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