问题补充:
She can help the house because shes 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:考查短语can help的用法。Can help do /to do sth 意为不能帮助干某事,can help doing sth 意为禁不住干某事本句意为她不能帮助打扫房子,因为她在忙着做蛋糕。