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

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

【答案】A

【解析】考查非限制性定語從句。句意：她和家人騎自行車去上班，這有助于她們保持健康。“____ helps them keep fit”是非限制性定語從句，該從句修飾整個主句，引導詞在從句中做主語，故該從句應用關系代詞which引導。A選項正確。

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