Mr Smith is one of the goreign experts who_____in China. A works B is working C are working D has been working.应该选什么,为什么.

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Mr Smith is one of the goreign experts who_____in China. A works B is working C are working D has been working.应该选什么,为什么.
Mr Smith is one of the goreign experts who_____in China. A works B is working C are working D has been working.应该选什么,为什么.

Mr Smith is one of the goreign experts who_____in China. A works B is working C are working D has been working.应该选什么,为什么.
C are working,定语从句,限制的对象是the foreign experts