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If a better material______, the cost of the product would have been decreased.
If a better material______, the cost of the product would have been decreased.
admin
2014-01-06
20
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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