—Do you love teaching Miss He?—I fell in love with teaching in 2000. I for twelve years

问题补充：

—Do you love teaching, Miss He?

—I fell in love with teaching in 2000. I for twelve years by this summer.

A. will teach

B. would have taught

C. has been teaching

D. will have been teaching

答案：

A. will teach

B. would have taught

C. has been teaching

(答案→)D. will have been teaching

解析：答案：D考查时态。由答语时间状语“by this summer”可知，应该用将来完成进行时。