These professors had interrupted their own research to accept an invitation to _______in an unusual experiment .A.take a partB.take partC.play a partD.play part
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B解析这题考查固定词组：take part in“参加”，句意是：这些教授中断了自己的研究接受邀请参加一次不寻常的实验。选B。take/play a part in“起着作用”，不符合句意。选B。