Cleverness is not always a ________ of high grades in exams. You’d better learn knowledge carefully and practice more.A.resultB.recordC.guaranteeD.reaction
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C解析这题考查词义辨析：guarantee 保证，担保；result 结果；record 记录；reaction反应，回应。句意：聪明并不总是在考试中取得好成绩的保证，你最好用心多学知识并多练习。选C。