Scientists all agree that if he had actually touched the key, he _______ from the electric shock.
A . must have died B . should die C . would have died D . has been dead
C
【详解】考查虚拟语气。句意:科学家们一致认为,如果他真的碰了钥匙,他就会死于电击。结合上文 if he had actually touched the key 可知与过去事实相反:主句用 would (should, could, might) +have+ 过去分词,从句用过去完成时。故选 C 。