she ________herself to be good at typewriting.A.was proved b.has been proved C.proved d.is being proved 为什么选C

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she ________herself to be good at typewriting.
A.was proved b.has been proved C.proved d.is being proved 为什么选C

prove (证明),此处作为不及物动词,没有被动语态!ABD都是被动态,所以只能选C.