填空题 {{U}}Electronic{{/U}} mail to describe an upcoming workshop {{U}}should use{{/U}} only {{U}}if{{/U}} potential participants use this form of communication {{U}}regularly{{/U}}. 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。