题目内容：

．---- Were all the passengers on the bus injured in the accident sent to hospital?
---- No,_____ only the four who got hurt seriously.
A.there was B.there were C.that was D.it was

优质解答

选D
这里是it 做形式主语,only the four who got hurt seriously was sent to hospital.
其他的词语没有这个用法.
这里用there be 句型的话,句子就缺主语了.