I will certainly be surprised if he____to tell them what he knows/A.dare B.will dare C.dared D.dares应该选什么啊、?、、?

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I will certainly be surprised if he____to tell them what he knows/A.dare B.will dare C.dared D.dares应该选什么啊、?、、?
I will certainly be surprised if he____to tell them what he knows/
A.dare B.will dare C.dared D.dares
应该选什么啊、?、、?

I will certainly be surprised if he____to tell them what he knows/A.dare B.will dare C.dared D.dares应该选什么啊、?、、?
选D.dare既可以做实意动词,又可以做情态动词.做实意动词时有人称、数的变化,前面的主语是he,第三人称单数,故A不对.再一个,由 If 引导的条件从句,当主句用将来时,从句用一般现在时.故B和C不对.
所以正确答案为D.

A dare跟must 差不多在这。