___the costs efforts spent on market research are too great, the exporter must quickly narrow__

[单选题]___the costs efforts spent on market research are too great, the exporter must quickly narrow___the scope of his research.

ASince, downb.While,upc.Although,outd.When,prohibit

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参考答案

试题答案：

A

答案解释：

本题考查连词和固定搭配的用法。由于前后两句表示的是因果关系，因此应用连词since，其意为“由于”。Narrow down为固定搭配，意为“缩小”。因此，选A。句意:由于在市场研究上所花的费用和所作的努力太大，出口商必须迅速地缩小研究的范围。

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