高一英语单选求解twenty students wanted to skip history class,but only two thirds____ permissiona.has been givenb.given c.were givend.was given

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高一英语单选求解twentystudentswantedtoskiphistoryclass,butonlytwothirds____permissiona.hasbeengivenb.givenc.

高一英语单选求解twenty students wanted to skip history class,but only two thirds____ permissiona.has been givenb.given c.were givend.was given
高一英语单选求解twenty students wanted to skip history class,but only two thirds____ permission
a.has been given
b.given
c.were given
d.was given

高一英语单选求解twenty students wanted to skip history class,but only two thirds____ permissiona.has been givenb.given c.were givend.was given
C,时态是过去时,被动语态
肯定是C
三分之二指的是学生复数