My brother __ down while he __ his bicycle and hurt himself.

My brother __ down while he __ his bicycle and hurt himself.

题目
My brother __ down while he __ his bicycle and hurt himself.
A fell ,was riding B fell ,were riding
C had fallen ,rode D had fallen ,was riding
答案
My brother fell__ down while he was riding__ his bicycle and hurt himself.
答案是A.
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