Iusedtobeafraidtospeakinfrontofpublicbefore,butrecentl...

問題詳情：

 I used to be afraid to speak in front of public before, but recently I _____ a lot.

   A. have improved     B. improved           C. will improve             D. am improving

【回答】

A

知識點：動詞時態

題型：選擇題