The letter from her sister so（ ）her that she stayed awake half t

The letter from her sister so（ ）her that she stayed awake half the night, trying to think of a way to get back at her.
A、stirred
B、agitated
C、contented
D、threatened
【正确答案】：B
【题目解析】：本题考查词义辨析。stir：搅动；搅和；agitated：使不安; 使激动；content：满意，满足；threaten：威胁； 恐吓。句意：姐姐的来信使她焦虑不安，她彻夜未眠，要想办法报复她姐姐。故B选项符合题意。