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________ many times,I still didn't know how to operate the machine.
A.Having taughtB.Having been taughtC.Being taughtD.Teaching
B

试题分析:考查分词做状语。本句中的动词teach与句子主语I构成被动关系,可以使用过去分词done表示被动和已经完成;过去分词done="having" been done;后者强调的是已经完成,前者强调的是被动。教育:已经被多次教育,我仍然不知道如何操作这部机器。故B正确。
点评:当分词做状语的时候,如果构成分词的动词与句子的主语构成主动关系,就使用现在分词做状语;当二者构成被动关系,使用过去分词做状语。如果分词的动作发生在谓语动词之前,就使用分词的完成式。如果分词与句子的主语没有关系,可以使用状语从句或者独立主格结构。
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