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
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