- Has Sam finished his homework today? -I have no idea. He it this morning. A. did B. has ——青夏教育精英家教网—

摘要：- 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

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

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

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