这里的could应该是表示一般过去的时态，那后面的句子要么就用一般过去式，要么就用过去完成时，这样时态上才符合逻辑His relatives could never understand why Henry did such a crazy thing.他们不能理解他为什么会作出如此之事。His relatives could never understand why Henry had done such a crazy thing. 他们不能理解他当时为什么会作出了如此之事。如果要用C,时态上要His relatives can never understandwhy Henry has done such a craz...
