It was at the airport was completed last year he worked as a volunteer helping foreigner

It was at the airport was completed last year he worked as a volunteer helping foreigners in need of translation service.
A. which; where
B. that; where
C. which; that
D. where; what

A. which; where B. that; where(答案→)C. which; that D. where; what解析：考查定语从句和强调句型。本题第一空which指代先行词the airport在定语从句which was completed last year中做主语，第二空that与句首的it was构成强调句型。句意：就是在去年完工的机场里他充当一个志愿者来帮助那些需要翻译服务的外国人。故C正确。

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