Bob,______Japanese at college, offered to translate the article for me.

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问题 Bob,______Japanese at college, offered to translate the article for me.

选项 A、learned
B、having learned
C、being learned
D、to have learned

答案B

解析 考查非谓语动词和时态。句子的主干是Bob offered to translate the article for me,两个逗号之间的部分作状语。因此用现在分词形式作状语。且“学习日语”在先,“主动翻译”在后,即动作先于谓语动作发生,所以用现在分词的完成形式。故选B。
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