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【单选题】

It was at the airport _____ was completed last year _____ he worked as a volunteer helping foreigners in need of translation service.
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
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参考答案:
参考解析:
.
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