professor kept speaking about his new discovery in the field, only ____ occasionally to have a mouthful of tea.得分：4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.得分：4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4

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