问题
选择题
Mary _____ go to school by bike, but now she usually takes a school bus to school. [ ]
A. used to
B. had to
C. was afraid to
D. preferred to
答案
答案：A
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Mary _____ go to school by bike, but now she usually takes a school bus to school. [ ]
A. used to
B. had to
C. was afraid to
D. preferred to
答案：A