【题目】I clean my bedroom ________ about twenty minutes ________Sundays.
A. for; at B. at; at C. for; on
【答案】C
【解析】句子意思是: 星期日我打扫我的卧室大约20分钟. 根据句意第一空表示一段时间用介词for, 第二空在周日用介词on. 故答案为: C.
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