单选题 The speaker ______ have criticized the paraprofessionals, knowing full well that they were seated in the audience.
A. should not to B. must not
C. ought not to D. may not

【正确答案】 C
【答案解析】[解析] 近义辨析。
此处需注意情态动词的用法：ought (not)/to与should (not)后接完成时态意思相同，表示为本应做某事儿而未做(或本不应做而做了)感到遗憾，因此应选C。