Question

The teacher,with6girls and8boys of her class,（ ）visiting a museum when the earthquake struck A...

The teacher,with6girls and8boys of her class,（ ）visiting a museum when the earthquake struck A,wasB,wereC,had beenD,would be 为什么选择A

Answer 1

因为主语是The teacher 三人称单数
再从状语when the earthquake struck 来看， struck 这个过去式指明是过去， 所以用was

当名词或代词后跟有with, as well as, as much as, no less than, along with, like, rather than, together with, but,except, besides, including, in additionto, combined with等连接作主语时，谓语动词一般和前一名词或代词的人称和数一致。 如：
John with his roommates is to blame.
约翰，而不是他的室友，应该受到责备。

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Answer 2

考察主谓一致原则。不能从意义上判断谓语的单复数。首先，主语是the teacher 然后，with....引导的遵循就远原则。