楼主的这个句子是错误的,正确的应该是：
it is hard for only one girl to keep the classroom clean every day.
keep +宾语 +形容词作宾补
it is hard for only one girl to keep the classroom to clean every day 为什么用to clean
it is hard for only one girl to keep the classroom to clean every day 为什么用to clean
还有keep的用法
还有keep的用法
英语人气：782 ℃时间：2020-04-01 13:59:52
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