杭州交通信息网中国高铁最高时速:___ several times, but he still doesn't know how to use the cleaner.
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___ several times, but he still doesn't know how to use the cleaner.
a.Having been shown b.I have shown him 为什么用B不用A 请详细分析!
a.Having been shown b.I have shown him 为什么用B不用A 请详细分析!
呵呵，是选B
给你简单说说：
楼主选A的解释应该是（现在）分词做状语，但请看后面还有一个but.按楼主的思路，此句应为：
Having been shown several times,he still doesn't know how to use the cleaner.对吧，不能有but.
所以此处就是一个简单的but转折句。
“我和他说了好多次，但他仍然不知道怎样用清洁器。
我已经演示给他看好几遍了但是他还是不懂怎么用
31. ___ several times,....
32. ___ several times, but he still doesn't know how to use the cleaner.
___ several times, but he still doesn't know how to use the cleaner.
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In modern times ___ parts of the interior of North America are inaccessible.
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