some kind of 和some kinds of 的区别

问题描述:

some kind of 和some kinds of 的区别
顺便说一下这个题吧
at first i thought it was-------
A.some kinds of joke B.a type of jokes
C.some kind of joke D.joke of a kind

某一种类的...
某些种类的...
应选C,因为主语是单数,不能选A主语是哪一个阿i 还是 it 还是joke宾语从句的主语是单数也就是 it was 是单数,因此后面的表语不能用复数,所以不能选A如果不考虑单复数,换一种语境,A是没问题的请问一下indoor/ indoors /in door/at indoors的区别 谢谢