问题补充：
I can’t help the house because I’m busy making a cake.
A. to clean
B. cleaning
C. cleaned
D. being cleaned
答案：
(答案→)A. to clean
B. cleaning
C. cleaned
D. being cleaned
解析：有些动词和短语后既可接不定式作宾语，也可接动名词作宾语，但含义不同。常用的有：remember to do sth. 记住去做某事；remember doing sth.记得做过某事。forget doing sth.忘记做过某事；forget to do sth.，忘记去做某事。regret to do sth.对将要做的事表示抱歉（遗憾）；regret doing sth.后悔做过某事。try to do sth.设法做某事；try doing sth.做一下试试看（能否成功）。mean to do sth.打算做某事；mean to do sth.打算做某事；mean doing sth.意味着。stop to do sth.停下来做某事；stop doing sth.停止做某事。go on to do sth .（做完一件事后）接着做（另一件事）；go on doing sth .继续做某事（同一件事）.can’t help to do sth.不能帮助做某事；can’t help doing sth.情不自禁地做某事。
