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 题目和参考答案——青夏教育精英家教网—

题目内容

_________several times, but Mary still has no idea of how to do it properly.

A．Being shown

B．Having shown

C．Having been shown

D．I’ve shown her

此题因为题干已经有连词but，所以不能再使用分词作状语因为分词相当于状语从句，所以答案D。

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