题目内容

Some students are so ______ that they often make mistakes in their homework.
A.carfulB.seriousC.carelessD.successful
C
词义辨析。careful仔细的;serious严重的;careless 粗心的;successful成功的。根据句意:他们做作业经常犯错误,应该是粗心才会引起错误的。故选C。
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