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【题目】She and her family bicycle to work, _________ helps them keep fit.

A. which B. who C. as D. that

【答案】A

【解析】考查非限制性定语从句。句意她和家人骑自行车去上班,这有助于她们保持健康。“____ helps them keep fit”是非限制性定语从句,该从句修饰整个主句,引导词在从句中做主语,故该从句应用关系代词which引导。A选项正确。

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