​Tom insisted that John ___ it for no one was in the r

​Tom insisted that John ___ it for no one was in the room except him.
Tom insisted that John ___ it for no one was in the room except him.A.do B.does C.did D.would do
为什么不是C?

C
这里表示【坚持认为是某一回事】,所以不能用虚拟语气A
如果表示【坚持主张该怎么做】,便要用虚拟语气
如：
He insisted that he 【was】 right and that he 【（should） not be punished】
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