单选题 It is important that the hotel receptionist ______ that guests are registered correctly.
  • A. has made sure
  • B. made sure
  • C. must make sure
  • D. make sure
【正确答案】 D
【答案解析】[解析] 在“It is important that…”虚拟语气结构中，that从句中should可省略。此类考题已出现许多次。