used to do否定句
used to do的否定句形式是sb didn't use/used not to do sth，二者皆可。例句：I didn't use to have a calculator。used to意...
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used to do的否定句形式是sb didn't use/used not to do sth，二者皆可。例句：I didn't use to have a calculator。used to意...
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