If a better material had been used, the quality of the product (raise) ______.wo

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问题 If a better material had been used, the quality of the product (raise) ______.

选项

答案 would have been raised

解析本题测试的是虚拟语气的用法。全句的意思是：“如果能用更好的材料，产品的质量就能够提高。”这是与过去事实相反的虚拟句，if条件句用过去完成时，主句用“情态动词+have done”。此外，还要用动词的被动语态。因此，应该填would have been raised。

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