单项选择题

A joint venture is in work at the Export Commodities Fair.（）

A. 出口商品交易会上，一家合资企业正在酝酿之中。
B. 出口商品交易会上，一家合资企业正在工作着。
C. 一家合资企业正在出口商品交易会上进行交易。
D. 一家合资企业在出口商品交易会上准备成立。

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