If I had worked harder at school I in a comfortable office now.A. would have satB. had s

问题补充：

If I had worked harder at school, I in a comfortable office now.

A. would have sat

B. had sat

C. would be sitting

D. could sit

答案：

A. would have sat

B. had sat

(答案→)C. would be sitting

D. could sit

解析：考查虚拟语气。句意：如果在校学习更努力一点，我现在应该坐在舒服的办公室里面了。结合语境可知是对将来的虚拟，结合时间词now可知虚拟的是将来某种正在发生的动作，故选C。