单选题 It's required that the students ______ the term paper tomorrow.
A. finished B. finish C. will finish D. may finish

【正确答案】 B
【答案解析】[考点] 虚拟语气
[解析] 本题考查的是虚拟语气在主语从句中的用法。其结构为it+形容词或过去分词+主语从句，用虚拟语气，即“should+动词原形”(should可以省略)。类似的词有“essential, urgent, natural, important, desirable, necessary, ordered”等。