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3.Rex soon became an expert at opening the gate.雷克斯很快成了开门的专家。
expert表示“做/干……的专家/高手”时后面通常用 at doing sth.;表示在某一领域是“专家”、“权威”时可用介词in或on:John is an expert at driving a car.约翰是开车高手。
She is an expert in flowers.她是花卉方面的专家。
Sam is an expert on that problem.萨姆是研究那个问题的权威。
4.This time he was barking so that someone would let him out!这次它叫着让人把它放出去!
连词so that引导的是目的状语从句。(cf.本课语法)