问题
选择题
______ several times, but he still doesn't know how to do it properly. [ ]
A. Being shown
B. Having shown
C. Having been shown
D. I've shown him
答案
答案：D
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______ several times, but he still doesn't know how to do it properly. [ ]
A. Being shown
B. Having shown
C. Having been shown
D. I've shown him
答案：D