问题
选择题
Li Ming sometimes _______________ to school.[ ]
A. walk
B. walks
C. walking
D. walked
答案
答案：B
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Li Ming sometimes _______________ to school.[ ]
A. walk
B. walks
C. walking
D. walked
答案：B
R(g)+2L，此反应符合下图关系，该反应是下列哪种情况