Our teacher told us carefully in class.A. listen B. to listen C. listened D. listens

问题补充：

Our teacher told us carefully in class.

A. listen

B. to listen

C. listened

D. listens

答案：

A. listen

(答案→)B. to listen

C. listened

D. listens

解析：句意：我们的老师告诉我们在课上要认真听讲。tell sb. to do sth.告诉某人去做某事，tell后跟不定式做宾语补足语，故选B。