【题目】At no time ________ in the exam. It was unfair to punish them.
A. they actually cheated B. do they actually cheat
C. did they actually cheat D. they had actually cheated
在线课程【答案】C
【解析】
考查部分倒装。句意：他们在考试中绝对没有作弊。惩罚他们是不公平的。此处否定词组At no time位于句子开头，句子用部分倒装，结合句意可知句子是一般过去时态，故答案为C。