第12题: [单项选择]The mother said she would ______ her son washing the dishes if he could finish his assignment before supper. A. let down B. let alone C. let off D. let out 参考答案:C 答案解析:[考点] 动词词组辨析。A)let down的意思是“辜负”;B)let alone的意思是“更不用说”;C)let off的意思是“允许不干(某事)”;D)let out的意思是“泄露”。
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