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。