The twins are so much alike that i never know ( )is which

题目

The twins are so much alike that i never know ( )is which
what
who
which
whom
四个让你选
不然就只有2分辛苦分

答案

which
这两个双胞胎是如此的相似,以致于我分不清哪个对哪个.
如果前面用who,那么后面也用who.