题干
My brother_____while he_______ his bike and hurt himself.
A：fell; was riding
B：fell; were riding
C：had fallen; rode
D：had fallen; was riding
答案(点此获取答案解析）
A
My brother_____while he_______ his bike and hurt himself.
A：fell; was riding
B：fell; were riding
C：had fallen; rode
D：had fallen; was riding
