25 .Sir Denis,who is 78,has made it known that much of his collection
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D.翻译：丹尼斯爵士已经宣称,他的许多收藏将留给国家.
将来的事情,所以用be to do结构,又是被动,所以排除B.
补充：两个谓语层次不同,毫不相干.
Sir Denis是主语,has made是谓语,it是形式宾语,known是宾补,that从句是真正宾语.在这个从句中,much是主语,of his collection是介词短语作much的后置定语,is to be left是谓语,to the nation是介词短语作状语.
======以下答案可供参考======
供参考答案1:
A, leave to 赠送给.奉献给
78岁的DENIS先生出名了,因为他把很多珍藏的精品献给国家了