A fell ,was riding
固定句型 主语+ 一般过去时+when /while + 过去进行时, 表示一个动作伴随另一个动作进行
hurt himself 是与fell 并列作主句的谓语
My brother __ down while he __ his bicycle and hurt himself.
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
A fell ,was riding B fell ,were riding
C had fallen ,rode D had fallen ,was riding
英语人气：296 ℃时间：2020-01-26 03:31:11
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