Thechemistryteacherwarnsus
问题详情：
The chemistry teacher warns us__ in the laboratory.
A. not to smoke B. against smoking C. of smoking D. A or B
【回答】
D
知识点：介词
题型：选择题
问题详情：
The chemistry teacher warns us__ in the laboratory.
A. not to smoke B. against smoking C. of smoking D. A or B
【回答】
D
知识点：介词
题型：选择题
