问题描述：
改句子he wants to be a professional singer.he is singing for groups of people at the city hospital
合并成一个定语从句
he ______ ______ to be a professional singer is sing for groups of people at the city hospital
合并成一个定语从句
he ______ ______ to be a professional singer is sing for groups of people at the city hospital
问题解答：
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