It's strange that he ____ interest in much of his research.

问题描述:

It's strange that he ____ interest in much of his research.
A.should have lost B.would lose C.had lost D.will lost
应该选什么?请帮忙翻译下.

A
真奇怪,他应该对他大部分的研究失去兴趣了.(然而没有失去)