2. 外语
  3. (Electronic) mail to describe an upcoming workshop (should use) only (if) potential participants use this form of communication

(Electronic) mail to describe an upcoming workshop (should use) only (if) potential participants use this form of communication

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问题 (Electronic) mail to describe an upcoming workshop (should use) only (if) potential participants use this form of communication (regularly).
选项 A、Electronic
B、should use
C、if
D、regularly
答案B应改为should be used。
解析 主语是物(electronic mail)，故谓语应用被动语态。
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