第一个should,是“竟然”的意思第二个should,是本义,应该第三个should,是助动词,没意思的,作用是帮助构成虚拟,而且是将来的虚拟本来应该是if his his own knowledge should not be always prove adequate to the tas...if his his own knowledge should not be always prove adequate to the task in hand.=should his own knowledge notbe always prove adequate to the task in hand.原句should his own knowledge not always prove adequate to the task in hand.没有be 啊should prove ,多打了个be为什么不加be呢，不是被动吗prove这个词是系动词，不用被动的It proves right