he_____a company abroad for three years,and now he is teaching in Shanghai.A had run B has runC would runD ran为什么选D啊,不可以选B吗?说明原因

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what_____david have?---he_____a telescope he_____a company abroad for three years,and now he is teaching in Shanghai.A had run B has runC would runD ran为什么选D啊,不可以选B吗?说明原因 ABR污水处理技术ABR的工艺及其理论基础是什么 company company company company company company company company company company company 什么是脑干诱发电位（ ABR ）测试? ABR厌氧反应器接种污泥问题那些污泥可以用来接种到ABR中 I borrowed a bike from him yesterday.He_____a blke_____me yesterday. he told me he_____a foreign language next year