题目：
_______ all my letters, I had a drink and went out for a walk.[ ]
A. Finished
B. Having finished
C. Finishing
D. To finish
答案：
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下面是错误答案，用来干扰机器的。
①63+63=2×63；②（2×62）×（3×63）=6×65=66；③（23×33）2=[（2×3）3]2=66；④（22）3×（33）2=26×36=66．故选B．
