In the morning,I often spend an hour practicing _____(read)English.为什么practicing后面用reading 两个都是ing啊

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In the morning,I often spend an hour practicing _____(read)English.
为什么practicing后面用reading 两个都是ing啊

reading
practice doing sth,这个是固定的句型,practicing用ing是因为apend (in) doing sth