If a better material______, the cost of the product would have been decreased.

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问题 If a better material______, the cost of the product would have been decreased.

选项 A、had been used
B、had been using
C、being used
D、using

答案A

解析 if引导的条件从句如果对过去事实进行虚拟，从句时态是if…were／did…，而主句谓语动词用情态动词过去式加上动词原形。

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