____ leaves the room last must turn off the lights.

问题描述:

____ leaves the room last must turn off the lights.
A. AnyoneB. Who C. No matter who D. Whoever
Why D? not C?

No matter who是用来引导壮语从句的,意思为 “无论谁...”.而此处是需要填一个能够当主语以及主语从句引导词的疑问词,因此只能选D了.
其实平心而论,这句话最好的表达应该是:
Anyone who leaves the room last must turn off the lights.
可惜没有这个选项.