_________several times, but Mary still has no idea of how to do it properly.
A．Being shownB．Having shown C．Having been shownD．I’ve shown her
D
此題因?yàn)轭}干已經(jīng)有連詞but，所以不能再使用分詞作狀語因?yàn)榉衷~相當(dāng)于狀語從句，所以答案D。
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