Not only Mary but also her parents()seen the film already

题目

Not only Mary but also her parents()seen the film already
has
have
are
is
请问选什么啊

答案

Not only Mary but also her parents (have) seen the film already.
句意：不但玛丽已经看过这部电影,而且她的父母也看过了.
理由：时态是现在完成时,要用助动词have has.not only...but also使用的是就近原则,由离动词谓语最近的主语来确定单、复数,因为最近的主语是parents,所以要用复数形式have.