单项选择题
A. 人们应当永远把这个古老的真理记在心中，即“先人为主”。 B. 人们应当经常记住这样一句俗语——“先人为主”。 C. 人们应当永远记住这样一句俗语——“一见钟情”。 D. 人们应当经常记住“一见钟情”这个古老的法则。
A. have been organized B. have organized C. has been organized D. are organized
A. must have given B. had to give C. ought to give D. should have given