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The minister met the workers and engineers _________ on the project in Zambia, most ______ were from Jiangsu, China.

　 A. worked, of whom　　　　　　 B. worked, of them　 C. working, of them D. working, of whom

The minister met the workers and engineers working on the project in Zambia, most ______ were from Jiangsu, ChinA.    

A. of which      B. of who       C. of whom       D. of them

The minister met the workers and engineers working on the project in Zambia, most ______ were from Jiangsu, China.       

A. of which           B. of who              C. of whom             D. of them