题目内容
15.It's necessary for you _______the classroom clean,class.( )| A. | keep | B. | keeping | C. | to keep |
分析 同学们,你必须保持教室干净.
解答 答案:C.
A.keep 动词原形; B.keeping 动名词或者现在分词; C.to keep 动词不定式.在it is+形容词 for sb to do sth,句式中it代替动词不定式做形式主语,结合句意,故选C.
点评 仔细分析句子的结构,掌握一些固定用法,根据具体内容作答.
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