I took the wrong train _______. I didn’t even know it un Wap版

试题详情及答案解析

I took the wrong train _______. I didn’t even know it until half an hour later .

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

答案：B

试题分析：句意：我错误地乘错了火车。甚至直到半小时后我才发现。by mistake错误地。故选B。
考点: 考查固定词组的用法。