"Mr.Smith has two ________ ,both of whom are teachers in a s

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"Mr.Smith has two ________ ,both of whom are teachers in a school."
A.brother-in-law
B.brother-in-laws
C.brothers-in-laws
D.brothers-in-law

答案D
解题思路：复合名词复数的构成方式有：
1)将主体名词变为复数,如：fathers-in-law岳父,passers-by过路人,lookers-on旁观者；
2)无主体名词构成的复合词,在词尾加复数,如：grown-ups成年人,good-for-nothings无用的人,go-betweens中间人,look-outs守望者；
3)由man,woman,lord构成的复合名词应将前后两个词都变为复数形式,如：man doctor-men doctors,woman singer-women singers,lord mayor-lords mayors．

Mr. Smith has two ________ , both of whom are teachers in a Mr.Smith has two __________ ,both of whom are teachers in a He has two sons,both of whom are teachers.和He has two sons b 1 .He has two sons.Both of 应该填whom还是who are teachers .2.He h He has two sons,1.and two of them are teachers.2.two of whom He has two sons,both of whom are workers.此句中whom可以换成them吗? He has two sons,both of whom are workers.此句中whom可以换成who和whic 英语翻译Mr.Smith and Mrs.Smith are both teachers.At the weekend, He has two sons,both of whom work as chemists. Both of the ________ are good at English.A.man teachers B.me Mr.Whte has two sons,___ looks like him.A:all of them B:both i have two brothers,both of whom are doctors.到底whom 怎么用啊这里w