We all know that __________ is the first requirement for learning, (concentrate)
【正确答案】:concentration
【题目解析】:分析句子成份可知that引导的宾语从句中缺少主语,动词不能做主语,而名词可做主语,concentrate意为”集中“,是动词,其名词形式为concerntration集中,专心。
We all know that __________ is the first requirement for learnin
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