– Alex how long you in this school?--For three years. I’ll graduate in July.A. are; stu

问题补充：

– Alex, how long you in this school?

--For three years. I’ll graduate in July.

A. are; studying

B. do; study

C. will; study

D. have; studied

答案：

A. are; studying

B. do; study

C. will; study

(答案→)D. have; studied

解析：句意：亚历克斯，你已经在这个学校学习了多久呢？有3年了。我将在7月份毕业。后文有For three years.三年的时间，表示一段时间，句中用现在完成与how long一起连用，故选D