how much time_____ since the visitors came here?

问题描述:

how much time_____ since the visitors came here?
how much time_____ since the visitors came here?
A .has passed B.have passed
C.has past D.have past

正确答案为A.
这里缺少谓语,用动词,pass 是动词,past 不是动词.
句中从句中有since ,主句用现在完成时,How much time 作主语,谓语用单数.