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        1. Tom didn't go to school_______ this morning because he overslept.
          A.a(chǎn)t once B.on timeC.by accident D.a(chǎn)t present
          B
          考查詞語辨析。at once “立刻;馬上”;on time“按時”;by accident“偶然”;at present“目前;現(xiàn)在”。句意為“湯姆今天早晨沒有按時上學(xué),因為他睡過了頭”故選B.
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