All he did was ___ (help)the homeless chidren.

来源:百度知道 编辑:UC知道 时间:2024/09/23 14:37:52
告诉我为什么这么填,谢谢!

此句子类似于There is no choice but to wait.和He could do nothing but wait.一样,当句子中有do或其他形式且做实意动词时,后面的动词直接用原形,如果没有,则用不定式,即to do sth

to help

be to do