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     Tom     Mary took part in the party yesterday, because they were studying for their exam.
A.Either; or B.Both; and
C.Not only; but alsoD.Neither; nor
答案:D
试题分析:句意:汤姆和玛丽都没有参加昨天的聚会,因为他们在准备考试。Either; or或者……或者; Not only; but also不但……而且;Neither; nor既不……也不。当他们连接并列主语时谓语动词要遵循就近原则Both; and两者都;当它们连接并列主语时谓语动词用复数形式。结合后面的原因状语从句可知该选D。
考点:考查连词。