I will certainly be surprised if he____to tell them what he saw

题目

I will certainly be surprised if he____to tell them what he saw
A.dare B. will dare C.dared D. dares
答案应该选D为什么?请说明原因,谢谢~

答案

这句if句是第二种(有说是第一种,不管啦),即if句要用现在时,另一句用将来时
选d的原因是if句的主语是he,he之后的动词要加s或es啊.