【题目】It always takes the class a while to ______ at the start of the class.
A. settle on B. settle in
C. settle down D. settle up
在线课程【答案】C
【解析】试题分析：考查固定搭配。settle on sth.决定，选定；settle up付(账)；还清(欠款)；settle down (使)安静，(使)平静；定居，句意：这个班总得开始上课后好一会儿才能安静下来。故选C。