It is hard to imagine what I today if I hadn’t been admitted to Nankai Middle School 15 ye

问题补充：

It is hard to imagine what I today if I hadn’t been admitted to Nankai Middle School 15 years ago.

A. would have done

B. will do

C. am doing

D. would be doing

答案：

A. would have done

B. will do

C. am doing

(答案→)D. would be doing

解析：考察时态。句意：如果十五年前我被南开中学录取的话，很难想象我今天正在做什么。可知假设的是站在过去时间角度描述将来某个时间正在进行的动作，故用过去将来时态，选D。