donate one's time to do 还是to doing?
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donateone''stimetodo还是todoing?donateone''stimetodo还是todoing?donateone''stimetodo还是todoing?donateone''sti
donate one's time to do 还是to doing?
donate one's time to do 还是to doing?
donate one's time to do 还是to doing?
donate one's time to sth/to doing sth.