【题目】People are warned ________ in that city because there is some virus going around the city.
A. to not tourB. touring not
C. not to tourD. not touring
在线课程【答案】C
【解析】
考查动词不定式的固定搭配。句意：人们被警告不要在那个城市旅游，因为有一些病毒在城市里传播。固定结构：warn sb. to do sth.“警告某人做某事”。此处是被动语态，是动词不定式的否定形式作主语补足语，故选C。