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12．who/why/how/whether/if/than引导的名词性从句＋单数谓语。 How he got there is unknown. 不知道他是怎样到那儿的。 13．Many a ＋单数名词作主语，谓语用单数。 Many a student has attended the lecture. 很多学生已经听了演讲。 14．More than one ＋单数名词作主语，谓语用单数。 More than one book was sent to the school for the poor kids. 很多书送去那个学校给那些可怜的孩子。 15．One and a half ＋复数名词作主语，谓语用复数。 One and a half aspirins are left in the bottle. 瓶里还剩一片半的阿斯匹林。 【知识运用】填空题： 1. An expert, together with some assistants, __________ sent to help in that work. 2. This is one of the best novels that __________ appeared this year. 3. Do you know the boys who __________ over there? 4. Our family __________ a happy one and our family are friendly. 5. About 40 percent of the books here __________ worth reading. 答案： 1. was 2. have 3. are 4. is 5. are 1. Entering the room, the headmaster said, “Everyone ________ quiet, please.” A. keep B. keeps C. is keeping D. to keep 【分析】A 此题容易误选B，因为主语 everyone通常被视为第三人称单数，所以其后谓语用 keeps。但事实上，最佳答案应是A，注意句末的 please，它表明此直接引语为祈使句，只不过该祈使句带上 everyone 这个主语。既然是祈使句，所以动词用原形，即选A。 2. In fact, ________ one cause that leads to the problem. | 
