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【题目】To keep healthy, Mr. Zhang spends ________________ hour doing exercise every morning.

A.aB.theC./D.an

【答案】D

【解析】

句意:为了保持健康,张先生每天早上花一小时锻炼。

考查不定冠词。根据句意可知这里是表示数量“一”,用不定冠词a/anhour以元音音素开头,用an,故答案为D

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