...you carrying too much on your back at school? I'm su_百度...
根据上下文Everyone was very nervous,but he was as cool as a cucumber---he just crawled back out,put the dog on its lead,and went home."每个人都很紧张,但他泰然自若——他刚爬了出来,把狗牵上,然后回家了.可知每个人都很紧张,but但是,表示转折,结合选项,应说但他很从容,所以as cool as a c...