问题补充：
I’m so busy today that I can’t the house.
A. help cleaning
B. help cleaned
C. help to clean
D. helped clean
答案：
A. help cleaning
B. help cleaned
(答案→)C. help to clean
D. helped clean
解析：考查词组：句意：我今天太忙了，不能帮助打扫房间。Can’t help do sth不能帮助做…，can’t help doing情不自禁做…，选C。
