18 表示所属关系或部分与整体关系时用介词of Track18
先行词与从句表示所属关系或部分与整体关系时，关系词前的介词常用of，此时of要前置。
a.I bought a book of which the author is a farmer. = ...the author of which...
b.The company, of which Max Harrison was until recently the chairman , has made loss of three million pounds this year.
这家公司今年亏损达三百万英镑，直到前不久马克斯·哈里森还是它的董事长。
c.I saw two dwarfs at the circus of whom neither was over three feet tall. = ...neither of whom...
d.The total cultivated area is 13,000 acres,_________10,000 acres are irrigated fields.
A. which
B. of which
C. in that
D. of that
正确答案：B。
分析：在13,000英亩中有10,000英亩是需要灌溉的田地，描述的正是部分与整体关系，所以选B。
e.The course normally attracts 20 students per year,_________up to half will be from overseas.
A. in which
B. for whom
C. with which
D. of whom
正确答案：D。
分析：同样表示部分与整体的关系，相当于up to half of the 20 students，所以选D。
与此结构类似的有：a number of whom/which，half of whom/which，the youngest of whom等，即限定词（some，any，none，all，both，several，enough，neither） / 数字 / 最高级+ of whom/of which的结构。
a.I bought a book of which the author is a farmer. = ...the author of which...
b.The company, of which Max Harrison was until recently the chairman , has made loss of three million pounds this year.
这家公司今年亏损达三百万英镑，直到前不久马克斯·哈里森还是它的董事长。
c.I saw two dwarfs at the circus of whom neither was over three feet tall. = ...neither of whom...
d.The total cultivated area is 13,000 acres,_________10,000 acres are irrigated fields.
A. which
B. of which
C. in that
D. of that
正确答案：B。
分析：在13,000英亩中有10,000英亩是需要灌溉的田地，描述的正是部分与整体关系，所以选B。
e.The course normally attracts 20 students per year,_________up to half will be from overseas.
A. in which
B. for whom
C. with which
D. of whom
正确答案：D。
分析：同样表示部分与整体的关系，相当于up to half of the 20 students，所以选D。
与此结构类似的有：a number of whom/which，half of whom/which，the youngest of whom等，即限定词（some，any，none，all，both，several，enough，neither） / 数字 / 最高级+ of whom/of which的结构。
