中文谷He has been studying Chinese history
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问题详情：
He has been studying Chinese history______three years. A、since B、in C、about D、for
【回答】
D
知识点：介词和介词短语
题型：选择题
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问题详情：
He has been studying Chinese history______three years. A、since B、in C、about D、for
【回答】
D
知识点：介词和介词短语
题型：选择题
