第8题: [单项选择]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 参考答案:C 答案解析:句意:(会议)要求所有参会的国际代表都要带来本国的纪念品。这里应该用被动语态,又因为 delegates是复数形式,所以 C 选项正确。