At that very moment I thought Liang Bo the winner of The Voice of China though I was no

问题补充：

At that very moment, I thought Liang Bo the winner of The Voice of China, though I was not 100% percent sure.

A. might be

B. must be

C. could be

D. might not be

答案：

A. might be

(答案→)B. must be

C. could be

D. might not be

解析：考查情态动词辨析。Might也许；must一定，必须；could可能;句意：在那时，我认为梁博一定是冠军，尽管我不是百分百的肯定。根据句意说明使用must。故B正确。