Question

【题目】I took her bag ________.

A. by mistakes B. by mistake C. with mistake D. with mistakes

Answer 1

【答案】B

【解析】句意：我错拿了她的书包。by mistake是固定短语，错误地，无意地，介词必须用by，mistake用单数形式，故应选B。其他短语都不成立。