Customers have to fill out forms which (mail) _____ to them. are mailed本句有which引

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问题 Customers have to fill out forms which (mail) _____ to them.

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答案 are mailed

解析本句有which引导的定语从句，其逻辑主语forms“表格”与mail之间是逻辑上的主动关系，表格只能是被寄送给顾客的，所以此处用被动语态。还要注意forms是复数形式，被动语态的be动词也要用复数。结合主句是一般现在时态，填入are mailed。

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