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All of our equipment dates back to the 1...

All of our equipment dates back to the 1960s and 1970s; we cannot make products that compete with foreign products,       we can buy the necessary technology.

A. unless    B. while

C. once    D. if

 

A 【解析】 考查从属连词辨析。句意:我们所有的设备都可以追溯到20世纪60年代和70年代;除非我们能买到必要的技术,否则我们不能生产与外国产品相竞争的产品。A. unless除非; B. while 当…时候;C. once一旦;D. if如果。分析句子可知,本句为条件状语从句,所以应用表示条件的从属连词,故unless符合句意。故A选项正确。  
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