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_______ several times, but he still doesn’t know how to do it properly.

A.Being shown B.Having shown him
C.Having been shown D.I’ve shown him

D

解析试题分析:句意:我已经给他演示了好几次了,但是他还是不知道如何恰当地做。But 是表示转折的并列连词,其前后都应该是完整的句子。而A. Being shown是现在分词的被动形式; B. Having shown him 是现在分词的完成形式; C. Having been shown是现在分词的完成被动形式,均不符合语法意义。
考点:考查并列句的用法。

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