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  • 科目:英语
  • 题型:单选题
  • 难度:较易
  • 人气:1148

The professor, ________ his assistants,  _______ conducting the experiment.

A.in addition, is B.as well, is
C.in addition to, are D.as well as, is
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Theprofessor,hisassistants,con