问题
选择题
My brother _____ to the ground while ____ his bicycle and hurt his leg .
A． falls; is he riding
B． fell; he was riding
C． fall; he is riding
D． felt; was he riding
答案
答案：B
题目分析：句意：我哥哥骑自行车时摔到地上摔伤了腿。while后跟过去进行时，此处主句用过去时，fall的过去式是fell，故选B。