填空题 (Electronic) mail to describe an upcoming workshop (should use) only (if) potential participants use this form of communication (regularly). A. Electronic B. should use C. if D. regularly
  • 1、
【正确答案】 1、B应改为should be used。    
【答案解析】[解析] 主语是物(electronic mail)，故谓语应用被动语态。