问题
选择题
His English ________ a lot since he took the course.
A．improved
B．was improved
C．has improved
D．has been improved
答案
答案：C
题目分析：句意：自从他上了这个课程，他的英语提高了很多。since引导的时间状语，主句要用现在完成时，his English是单数形式，所以用助动词has，故选C。