问题
ars, it was viewed as a serious problem,________ that has never been really solved.
A:one
B:where
C:it
D:which
B:where
C:it
D:which
正确答案是：
同类题型
Under good treatment, Linda is beginning to _________ and will soon recover.
_—Can you tell us your for happiness and a long life—Living every day to the full, definitely.
My sister met him at the Grand Theatre yesterday afternoon, so he ________ your lecture. [ ]
Finally he reached a lonely island ________ was completely cut off from the outside world.