1 on doing= as soon as do
2 D 的 so 和 enough 只能取其一.二者取其一就对了.
3 go swimming 固定搭配.go for 运动doing 彻底错了,运动没有这么表达的.go to swim 语法不错但是和go swimming意思不一样,说的是你在走路,目的是swim.
4fool 作名词可数B错.such n as to do和so adj as to都是固定搭配,D错.他俩意思不同.我相信她怎么怎么样,我可真是个笨蛋；我是如此之蠢,以至于我相信她怎么怎么样.
5thinking over 就对了.need doing=need to be done.没有need being done.
6adj.of sb 也算不上“固定搭配”.形容词描述的是人就用of,说的是事就用for sb.
7get to do 是使役动词.让人做.get sth done意思不一样,是“使某事完成”.
8和rather没关系.I feel difficult doing something= something is difficult for me to do.