问题
选择题
He broke his legs while ＿＿＿＿＿.
A．riding
B．ride
C．was riding
D．rode
答案
答案：A
while riding＝while he was riding.
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He broke his legs while ＿＿＿＿＿.
A．riding
B．ride
C．was riding
D．rode
答案：A
while riding＝while he was riding.