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下句找语法错误并改正及说明原因Thequalityofmultivitamintabletsisdeterminedbyhowlongitspotencycanbeprotectedbythemanufacture'scoatingmaterial.

题目详情
下句找语法错误并改正及说明原因
The quality of multivitamin tablets is determined by how long its potency can be protected by the manufacture's coating material.
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答案和解析
The quality of multivitamin tablets is determined by how long their potency can last protected by the manufacture's coating material.
1 tablets复数概念,所以是their.
2 last 作为动词谓语存在.protected 作为 last 的伴随状态,作状语使用.