(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

解析 electronic mail和use是被动的关系,故应将should use改为should be used。
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