问题

___thefact that doctors have warned that smoking causes cancer, people still keep onsmoking
A:that
B:which
C:when
D:where
B:which
C:when
D:where
正确答案是:
同类题型
These wild flowers are so special that I would do ____I can to save them.
_____ being fun and good exercise, swimming is avery useful skill.
He is worried because he has no money to____ the school year.
I want to buy that kind of cloth because I have been told the cloth———well
” ” is used to tell us that we should learn something step by step.