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  _______ is well known _______ Hong Kong returned to China on July 1st, 1997.

A. It, that         B. As, /  C. As, as             D. It, which

_______ is well known, _______ Hong Kong returned to China on July 1st, 1997.

A. It, that            B. As, /  C. As, as             D. It, which

_______ is well known _______ Hong Kong returned to China on July 1st, 1997.

A. It, that　　　　　　　　 B. As, /

C. As, as　　　　　　　　　 D. It, which