问题
填空题
Tom usually spends half an hour ______(clean) his bedroom.
答案
参考答案：(on/in)cleaning
解析： spend time on/in doing sth. 表示“花时间做某事”。
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Tom usually spends half an hour ______(clean) his bedroom.
参考答案：(on/in)cleaning
解析： spend time on/in doing sth. 表示“花时间做某事”。