We ________ an English class today．They ________ an English class now．A.aren't having; are havingB.don't have; haveC.aren't having; haveD.don't have; are having
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D解析此题考查一般现在时与现在进行时的区别．today指通常情况下，即“在这一天他们没有英语课”，而不是正在进行的动作；而now表明“现在他们正在上英语课．”用现在进行时．选D．