______ I admit that all these problems are difficult, I don’t agree that they can’t be solved.
#32853
A
Unless
B
While
C
Until
D
Since
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Many people say they love birds, but some plant trees _________ some make cages.
#34093
A
until
B
though
C
unless
D
while
(2013·高考江西卷)She says that she’ll have to close the shop________business improves.
#30662
A
if
B
unless
C
after
D
when
—Are you guys ready for “The Campus Singers Competition”?—Sure!Since we are young, try it, _____ we will regret!
#31137
A
and
B
but
C
or
D
then
