问题
选择题
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
答案：B
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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