(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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