28. (1) I know it isn't important but I
can't help ___ about it.
A. think B. to think C. thinking D. to thinking
(2)I know it isn't important but I can't
help but ____ about it.
A. think B. to think C. thinking D. to thinking
(3)You'd better not smoke. It can't help
___ rid of your cold.
A. get B. to get C. getting D. but get
(4)I'm too busy , so I can't help ___ the
room .
A. to cleaning B. cleaning C. clean D. to clean