题目内容

When the teacher ______ how to do the experiment, the bell rang.

A. explains????????????? B. will explain ????????????? C. was explaining??? ????????????? D. is explaining

 

【答案】

C

【解析】

试题分析：句意:当老师正在解释怎样做这个实验的时候，铃响了。在本题所给的情景中，the bell rang用的是一般过去时，由此我们知道这里说的是一件过去的事情。且结合句意可知，是老师正在解释的时候，铃响了，故应该用过去进行时。Ａ选项为一般现在时；Ｂ选项为一般将来时；Ｄ选项为现在进行时。

考点：考查动词。

 

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