【题目】The chemistry teacher warns us ________ in the laboratory.
A. not to smokeB. against smoking
C. of smokingD. A or B
在线课程【答案】D
【解析】
试题分析：考查固定搭配。warn sb. (not) to do sth.警告某人做或不做某事；warn sb. against doing sth.警告某人不要做某事。句意：化学老师警告我们不要在实验室抽烟。根据句意，故选D。