单选题 All of the international delegates attending the conference ______ to bring a souvenir from their own countries.
  • A. has asked
  • B. is asking
  • C. were asked
  • D. was asking
【正确答案】 C
【答案解析】[解析] 各选项的意思为：主语“delegates”是复数，谓语动词应为复数形式。答案是C。