题目内容
_____ 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
解析:后半句有个but,前面应是一个完整的句子,而不是一个分词结构,由此可以看出,只有D项符合要求,如果去掉句中的but,应该选C。
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