问题补充：
— his bike is lost?
— He has to go to school on foot.
A. How about
B. What if
C. Can you tell me
D. I don’t know
答案：
A. How about
(答案→)B. What if
C. Can you tell me
D. I don’t know
解析：
试题分析: 句意:如果他的自行车丢了怎么办？他不得不步行上学。 How about怎么样，What if如果，Can you tell me你能告诉我， I don’t know 我不知道。根据He has to go to school on foot他不得不步行上学可知是在问如果自行车丢了怎么办，故答案选B.
