It was my grandfather _____ helped mike mend his bike this morning.
问题描述：
It was my grandfather _____ helped mike mend his bike this morning.
A.that B.whom C.which D.what
which,我觉得不对,感觉应该是who 究竟哪个对啊?
答
前面是 it was
如果单单是 grandfather 就是 that /who