你好,很高兴为你
楼主,我觉得你这个题目有点问题,你把spoke 打错成spoken了吧?
先把句子还原： It was who that spoke first at the meeting .
这里It 是主语,was是系动词,who that spoke first at the meeting .是表语,这个句子是一个强调句,强调的that以后的句子的主语.
再把句子改成疑问句,就是：Who was it that spoke first at the meeting ?
故正确答案为B.
望采纳,祝开心~!