professor kept speaking about his new discovery in the field, only ____ occasionally to have a mouthful of tea.（单选）—5分 A dropping off B breaking off C putting off D setting off

professor kept speaking about his new discovery in the field, only ____ occasionally to have a mouthful of tea.（单选）—5分
A dropping off
B breaking off
C putting off
D setting off

出自：河北建筑工程学院大学英语

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