【題目】Although he talked half an hour, he couldn't give us a good （explain）of the reason why he did it.

【答案】explanation
【解析】句意：他談了半個小時，但就為什么他做那件事仍未能給出一個合理的解釋。explanation名詞，“解釋”；give an explanation固定短語“做出解釋”，故填explanation。

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