.Class regulations require___is the last to leave the classr

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.Class regulations require___is the last to leave the classroom___off all the lights.
.A.who,should turn B.whom,shall turn C.whomever,turns D.whoever,turn
我知道正确答案是D为什么第一个空不可以用who?

其实应该是no matter who
无论谁谁最后离开教室,都要关灯.
如果只用who,少了成分,应改为：
Class regulations require he who is the last to leave the classroom

一道英语单选class regulation require —is the last to leave the cla ----Don’t forget to turn off the light when you leave classr Tom are the last personb to leave to leave句子成分 who was the last person to leave she is always the last one to leave the school. 1、Alice ( )the first to come and last to leave Jane,please turn off the lights befor—— you leave the classr he.is.always.the.last.person.__(leave)the.class,急 joe is the last person to leave the classroom,为什么要用to leave? she is slways the last to leave school every day. we go to last one ( ) (leave) the room the last to leave.谁能帮我分析一下这个短语?