nobody but Mr.Green and Bob____in the classroom yesterday.A.is B.was C.are D.were答案是用B``可是为什么要用B?

问题描述:

nobody but Mr.Green and Bob____in the classroom yesterday.
A.is B.was C.are D.were
答案是用B``可是为什么要用B?

be要用就近原则

因为在be动词前是单数!

首先,后面有yesterday,表明要用过去式
前面有and,be要用就近原则,用第三人称.