My brother _____ while he _____ his bike and hurt himselfA.fell was riding B.fell were riding C.was falling rode D.was falling riding 选哪个?为什么?

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My brother _____ while he _____ his bike and hurt himselfA.fell was riding B.fell were riding C.was falling rode D.was falling riding 选哪个?为什么?
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My brother _____ while he _____ his bike and hurt himselfA.fell was riding B.fell were riding C.was falling rode D.was falling riding 选哪个?为什么?
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?

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