- Has Sam finished his homework today? -I have no idea. He it this morning. A. did B. has done C. was doing D. had done 【查看更多】

 

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When first ______ to the market, their products enjoyed great success. 　　　　　　　　　　　　　　　　　　　　　　　 (2004 全國卷II)

　 A. introducing　 　 B. introduced 　 C. introduce D. being introduced

 

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