There are some warnings in some countries ______ over exploitation of underground water has caused the decline of wetland and increase of desertification.
#67588
A
which
B
where
C
what
D
that
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This outdoor training is an exercise , as we know, teenagers' confidence can be built.
#66966
A
which
B
what
C
that
D
where
-- Can I join their club?-- I am afraid you will be refused __________ you’ve passed all their tests.
#41251
A
if
B
although
C
unless
D
since