He has two sons, work as chemists． [ ] A．two of whom B．both of whom C．both of wh
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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
试题答案
答案：B
He has two sons, ________ work as chemists．
[]A．two of whom
B．both of whom
C．both of which
D．all of whom
答案：B