when I read magazine,I can't understand the English words ___them?

问题描述:

when I read magazine,I can't understand the English words ___them?
a,in
b,on
c,at
d,for

估计这里的magazine是指代一个种类,也就是指代杂志这个总的大类,如果要看单复数我想magazine就该指出来是哪个.
这个题选A