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We must keep our classroom______.
A. cleaning         B. clean            C. to clean
B
试题分析:本句中keep是系动词,后面接形容词作表语,故选B,干净的。
点评:keep sth adj保持某物怎么样,固定短语的考查也是英语考查的一个重点,熟记这些短语结构可以减少答题中的分析判断时间,所以平时加强短语记忆也是学好英语的关键环节。
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