The more people you meet, especially while (do)_______ volunteer work, the more contacts you’ll have.

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问题 The more people you meet, especially while (do)_______ volunteer work, the more contacts you’ll have.

选项

答案doing

解析 空格前为从句引导词while ,故所在空格为状语从句的省略式。when, while, if等引导的状语从句中,如果其谓语动词为be,而主语与主句的主语相同时,则从句的主语和be动词可省略。有时从句的主语为it时,也可省略it is。根据语法分析,所填空格处省略了主语you和be动词are。由此判断,you和do之间为主动,故用doing。
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