i was（）tired that i had to rest.A.so much B.so C.enough D.to

Bso+形容词/ 副词+that-从句 【如此。以至于。】为固定用法。再如：He is so short that he can't reach the apple。他是如此之矮以至于够不着那苹果。He runs so fast that none of us can catch him。他跑得如此之快,以至于我们一个都追不上他。that+从句为结果状语,而不是目的状语,楼上在忽悠。 再问： 那么其他的为什么不能选？求详细分析，只是因为有that，所以不能选吗 再答： so much+不可数名词+that-从句。如： There is so much ice on the road that we have to walk carefully。 形容词/副词+enough to do sth 足够。。。。。 如： He is old enough to look after himeself。 他大了，够照顾自己了。（=He is so old that he can look after himself) too+形容词/ 副词 to do sth【太。。。。。而不能。。。。。】以肯定句式表示否定含义。如： He is too young to look after himself。 (=He is so young that he can't look after himself= He isn't old enough to look after himself。) so。。。。。that。。。。与。。。。enough to do 。。。。与 too。。。。to。。。。。经常进行句型转换的。 祝你进步！理解请采纳，有问题再问。