Fast Mail returns packages and documents to senders______it fails to deliver the items to their intended recipients.

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问题 Fast Mail returns packages and documents to senders______it fails to deliver the items to their intended recipients.

选项 A、still
B、where
C、or
D、when

答案D

解析 空格前主语Fast Mail与谓语return构成一个分句,空格后主语it与谓语fails构成一个分句,可以连接两个分句的并列连词是(C)与(D)。根据上下文语义,此处意为“无法送达目的地时,邮件或物品将退回给寄件人”,这里应选时间状语从句引导词(D)when(当……时)。选(C)or(或者)会造成句意不通。(A)still是时间副词,表示“仍然,依旧”,(B)where是表示场所的关系副词。
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