My brother _____ while he _____ his bike and hurt himself
问题描述:
My brother _____ while he _____ his bike and hurt himself
A.fell was riding B.fell were riding C.was falling rode D.was falling riding 选哪个?为什么?
答
A
while 后的动词用进行时,排除 C D ,主语是HE 再排除B