(explain)  Jack didn't give a very adequate ________ for being late.
(explain)  Jack didn't give a very adequate ________ for being late.
【正确答案】:explanation
【题目解析】:构词知识题。空格处前面是动词give和形容词adequate,显然空格处要填一个名词。explain是动词,变为名词需要去掉in再添加名词后缀-nation。因此正确答案是explanation,表示“解释;说明”。
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