问题
选择题
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
答案
答案：A
题目分析：句意：我过去曾经害怕在公共场合说话，但最近我提高了很多。根据句中时间状语recently（最近）可知句中时态应用现在完成时态，故选A。