Mr. Smith is the only one of those engineers who in China. A. is working B. had been worki——青夏教育精英家教网—

摘要： Mr. Smith is the only one of those engineers who in China. A. is working B. had been working C. are working D. have been working

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Mr Smith is the only one of those engineers who ________ in China.

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A．is working　　　　　B．had been working

C．are working　　　　 D．have been working

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