Question

the teacher，with 6 girl and 8 boy of her class，＿＿＿visiting a museum when the earthquak

the teacher，with 6 girl and 8 boy of her class，＿＿＿visiting a museum when the earthquake happened
A was
B were
C had been
D would

Answer 1

was
the teacher，with 6 girl and 8 boy of her class，＿was＿visiting a museum when the earthquak

Answer 2

选A，visting表示进行时，需要判断用was还是were，主语是the teacher，单数用was，with结构是伴随状语。