they on the train? A.Do, havin...

____ they ____ on the train?

A.Do, having fun B.Are, having a fun

C.Are, having fun D.Can, having fun

C 【解析】试题分析：句意：他们在坐火车过得开心吗？由于have用的是having形式，说明句子是现在进行时态，A错；情态动词can后动词用原形，D错；fun是不可数名词，前不能加不定冠词a，B错。故选C。考点：考查动词短语。

考点分析：

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____ they ____ on the train? A.Do, havin...