【题目】Kim cleans her bedrooms ______ about 20 minutes ______ Saturdays. ( )
A.at; atB.for; forC.for; on
【答案】C
【解析】
句意为“金姆在星期六打扫卧室大约20分钟。”考查介词辨析。for加一段时间，星期前用介词on，故选C。
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