The required documents must be received______certified mail.

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问题 The required documents must be received______certified mail.

选项 A、via
B、toward
C、round
D、across

答案A

解析 本题是选择符合语义的介词的问题。空格前面的must be received(必须要接收)和后面的certified mail(挂号信)为解决问题提供了线索,由此判断表示“通过……,经由……”的(A)via是正确答案。
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