The amount of A pressure B which the materials are C subject to D affect the quality of the products.

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问题 The amount of A pressure B which the materials are C subject to D affect the quality of the products.

选项 A、 
B、 
C、 
D、 

答案D

解析 应改为affects,主语后带有较长的修饰语,误认了主语。
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