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    How and why Jack came to China not known. When and where to build the new library not been decided. A. is; has B. are; has C. is; have D. are; have 【查看更多】

     

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    How and why Jack came to China _____ not known. When and where to build the new library _____ not been decided.

        A. is; has           B. are; has          　　　 C. is; have            D. are; have

     

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