1.第一题考的是短语的并列,studying和practicing都是doing形式,所以perform也要弄成ing形式的.考并列的标志就是“逗号后面有and”即“...,...,and...”一定是并列.enable是前面三个并列短语共同的谓语动词.
2.在一个句子中,时态要统一,decided是过去,has led是现在完成（现在完成要对应现在时）,所以时态错误,应该改成had led或者直接说led,不可以出现has这种表示现在的动词.
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sat 语法题Studying dance for many years,practing difficult step
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