Please make sure that the file of requested information is attached ______to the

游客2025-06-13 2

问题 Please make sure that the file of requested information is attached ______to the document you send by mail.

选项 A、secure
B、securely
C、securable
D、security

答案 B

解析单词形态：副词1．选项均为动词secure的不同形式。2．空格内应填入副词来修饰动词attached，所以(B)为正确选项。

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