第19题: [单项选择]The professor requests that we ______ the term papers by the end of this month. A. will hand in B. will have handed in C. to hand in D. hand in 参考答案:D 答案解析:[解析] 本题考查的是“should do型”虚拟语气的用法。“should do型”虚拟语气以动词原形表示,用于表示愿望、请求、命令、决定、建议、设想等动词之后的that分句中,如:decide,d