Having been shown several times.he still doesn't know how to do it properly．题目和参考答案——青夏教育精英家教网—

14．Having been shown （show） several times，he still doesn't know how to do it properly．

分析已向他展示了好多次，但他仍然不知道怎样恰当地做这件事．

解答答案是Having been shown．
本题考查非谓语动词的用法．题干中逗号后面是完整的句子，逗号前后两部分没有连词或引导从句的引导词，故判断逗号前不是句子，show需要用分词做时间状语；show和句子主语之间是被动关系，并且强调分词show的动作在谓语动词之前已经发生，所以选用现在分词完成式的被动语态，故答案是Having been shown．

点评本题是要求用所给词的适当形式填空，解题时首先考虑句中需要的词性；其次，如果是谓语动词关注时态、语态和数的变化；如果是非谓语动词要联系非谓语的基本用法判断非谓语的形式；如果是名词关注单复数．

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