题目内容
2．Be quiet，please．The students _______ a class now．（ ）| A． | have | B． | had | C． | are having | D． | were having |
分析 请安静．学生们现在正在上课．
解答 答案：C
根据上文Be quiet，please．"请安静"及时间状语now可知，此句描述现在正在发生的事情，故用现在进行时态，现在进行时态的结构为is/am/are+动词的现在分词
故选C
点评 判断时态，不仅可以根据明显的时间状语，也可根据上下文情景
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