After the flooding，people were suffering in that area，________ urgently needed clean water，medicine and shelter to survive.(2012·江苏，22)
#30488
A
which
B
who
C
where
D
what
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(2013·四川省乐山一模)The pupils were playing games in the classroom ________ a gunman entered and began shooting wildly at them.
#30425
A
while
B
when
C
as
D
before
Just because they make more money than I do, _______ they seem to look down on me.
#79836
A
so
B
and
C
but
D
不填