He did nothing but do homework at home last night.为什么是do
问题描述：
He did nothing but do homework at home last night.为什么是do
答
因为but后面加原形
希望对你有帮助哦~
答
固定句型 but后选原形。记住这个就行
答
不定式在介词but,except,besides后面时,如果介词之前为do的某种形式,则后接不带to的不定式.
答
do nothing but do
can't do but do
can't choose but do
can't but do
以上都是固定搭配 but 后面只能用do 意思是“别无选择只能...”