问题
选择题
As close friends, they used to walk to school ________. [ ]
A. face to face
B. little by little
C. step by step
D. side by side
答案
答案：D
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As close friends, they used to walk to school ________. [ ]
A. face to face
B. little by little
C. step by step
D. side by side
答案：D