He had to extemporize because he had forgotten to bring his notes.
他因为忘了带讲稿,只好即席发言。
他因为忘了带讲稿,只好即席发言.
I played the organ at which he had extemporized so often.
名词::extemporization
过去式::extemporized
过去分词::extemporized
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