2. 外语
  3. When______the equipment I ordered last week, please be sure to include the detailed instructions.

When______the equipment I ordered last week, please be sure to include the detailed instructions.

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问题 When______the equipment I ordered last week, please be sure to include the detailed instructions.
选项 A、mail
B、mails
C、mailing
D、mailed
答案C
解析 单词形态：分词1．这是一道单词形态题，选项均为mail的不同形式。2．从属连词后的主语省略，不能只接动词，A、B选项排除。3．主句和从句的主语相同时。须省略主语，并使用主动语态的动词分词(一ing)。
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