问题
选择题
Tom didn't go to school _____ this morning because he overslept. [ ]
A. at once
B. on time
C. by accident
D. at present
答案
答案：B
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Tom didn't go to school _____ this morning because he overslept. [ ]
A. at once
B. on time
C. by accident
D. at present
答案：B