【题目】He looked into her eyes and his voice ________ a more serious tone.
A.took offB.took onC.took inD.took down
在线课程【答案】B
【解析】
考查动词短语辨析。句意：他看着她的眼睛，语气变得严肃起来。A. took off脱下；B. took on采取、呈现；C. took in吸收；D. took down记下。根据“a more serious tone”可知，此处表示“呈现”，故B项正确。