单项选择题
A．It could help people of all ages to avoid cancer. B．It was mainly meant for cancer patients. C．It might appeal more to viewers over 40. D．It was frequently interrupted by commercials.
A.The hotel clerk had put his reservation under another nameB.The hotel clerk insisted that he didn't make any reservationC.The hotel clerk tried to take advantage of his inexperienceD.The hotel clerk couldn’t find his reservation for that night