I tell you with certainty that he won’t be able to finish it before the deadline. A. will

问题补充：

I tell you with certainty that he won’t be able to finish it before the deadline.

A. will

B. must

C. can

D. may

答案：

A. will

B. must

(答案→)C. can

D. may

解析：

主要测试情态动词辨析。句子译文：我可以肯定地告诉你，他将无法在截止日期前完成它。此处应考虑所给选项的语气，由高到低排列如下：must、can、will、may。根据句子中with certainty，可知选择：can。