It is necessary that he ______ the assignment without delay.
【正确答案】 A
【答案解析】在“It is/was+形容词+that从句”中,that引导的主语从句谓语动词常用should+动词原形。用于该句型的形容词有necessary,good,important,right,wrong,better,natural,proper,funny,strange,surprising等。