He has two sons, work as chemists. A. two of whom B. both of whom C. both of which D. all of ——青夏教育精英家教网—

摘要：He has two sons, work as chemists. A. two of whom B. both of whom C. both of which D. all of whom

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He has two sons, __________ work as chemists.

A. two of whom　 B. both of whom 　 C. both of which 　　 D. all of whom

He has two sons, ________ work as chemists．

A．two of whom

B．both of whom

C．both of which

D．all of whom

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