Zhouqu, Gansu was attacked by such a terrible mud-rock flow        few residents had ever experienced before. 
#33066
A
as
B
which
C
where
D
that
推荐题目
We don’t doubt ________ the boy can ________ the angry teacher.
#34308
A
if; apologize for
B
whether; apologize to
C
that; apologize to
D
what; apologize
You can go out _____ you promise to be back before 11 o’clock.
#80241
A
so that
B
as far as
C
so long as
D
in case