The only one of +复数名词+ who/that./which 引导的定语从句中，定语从句的动词应为单数。

　　Mary is the only one of those people who keeps pets. 玛丽是唯一一个饲养宠物的人。

　　主谓一致练习

　　1. About 60 percent of the students _____ from the south, the rest of them _____ from the north and foreign countries.

　　A. are/is B. are/are　 C. is/are D. are

　　2. Half of the workers here _____ under 30 _____.

　　A. is/years B. are/year old C. is/years old D. are/years of age

　　3. Now Tom with his classmates _____ football on the playground.

　　A. play B. are playing　 C. plays D. is playing

　　4. The number of pages in this dictionary _____ about two thousand.

　　A. are B. has　 C. have D. is

　　5. Thirty dollars _____ too expensive.

　　A. are B. is C. were D. be

　　6. The audience _____ so large that no seat was left unoccupied in the great hall.

　　A. is B. are C. was D. has

　　7. The secretary and principal _____ at the meeting now.

　　A. are speaking B. is speaking C. were making a speech D. have a speech

　　8. "If anybody _____, please put down _____ name," said the teacher to the monitor.

　　A. wants to buy the book/his B. want to buy the book/their

　　C. will buy the book/one's D. wants to have the book bought/her

　　9. Nothing but one desk and six chairs _____ in the room.

　　A. are B. is stayed C. is D. are left

　　10. Having arrived at the station, _____.

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