—He has two brothers and three sisters. Do you know of them? —No I know of them. A. som

问题补充：

—He has two brothers and three sisters. Do you know of them? —No, I know of them. A. some; noneB. any; some C. any; noneD. either; some

答案：

指五者中的“任何一个”用any，“一个也不”用none。