题目内容

Tom didn't go to school_______ this morning because he overslept.
A．at once B．on timeC．by accident D．at present
B
考查词语辨析。at once “立刻；马上”；on time“按时”；by accident“偶然”；at present“目前;现在”。句意为“汤姆今天早晨没有按时上学，因为他睡过了头”故选B.
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