as an old teacher, he is respected by his students.[ ]A. Knowing B. Having known
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![as an old teacher, he is respected by his students.[ ]A. Knowing B. Having known](/pic/43_989933.jpg)
_________ as an old teacher, he is respected by his students.
[ ]
A. Knowing B. Having known C. Known D. To know
试题答案
答案:C