I think he is to tell us the secret but I’m not sure.A. possibleB. likelyC. impossibleD.

问题补充：

I think he is to tell us the secret, but I’m not sure.

A. possible

B. likely

C. impossible

D. certain

答案：

A. possible

(答案→)B. likely

C. impossible

D. certain

解析：词义辨析题。A. possible“可能”不能用人作主语B. likely “可能”主语可以是人或者物C. impossible 不可能 D. certain 一定句意：我认为他不可能告诉我们秘密但是我也不确定。根据语境选B