题目内容
6．Look!The students _____ the classroom．（ ）| A． | clean | B． | are cleaning | C． | are clean | D． | cleaning |
分析 看！学生们正在打扫教室．
解答 答案：B．考查现在进行时态．句意"看！学生们正在打扫教室．"．A一般现在时态．B现在进行时态．C系表结构．D动名词/现在分词．由look看，可知表示正在进行的动作，用现在进行时态，结构是is/am/are+动词的现在分词，主语是students复数，因此用be动词复数are，clean的现在分词是cleaning．答案是B．
点评 现在进行时态表示正在进行的动作，结构是is/am/are+动词的现在分词．be动词的单复数要与主语的单复数保持一致，结合语境完成试题．
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