The flu is believed by viruses that like to reproduce in the cells inside the human nose and throat. A.causing B.being caused C.to be caused D.to have caused 简析:选C.全句的意思是:“人们认为感冒是由病毒引起的.这种病毒喜欢在人的鼻子和喉咙中繁殖. “感冒 和“引起 之间为被动关系.这里叙述一般情况.应选C.B为“正在引起 .D为“已经引起 . 【查看更多】
