some mysteries still remain ___________ about the Mona Lisa.A、to be solved B、to solve C、solving D、be solved

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some mysteries still remain ___________ about the Mona Lisa.
A、to be solved B、to solve C、solving D、be solved

选择A
是一个等待持续的状态

a

A

选Aremain 是不及物动词,表示“尚待”、“留待”时,后面接被动语态的动词不定式。

a????///////