Most animals have little connection with animals of a different kind, _______ they hunt them for food.
#32650
A
if
B
while
C
unless
D
as
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Many young people don't work hard, and regret it later when the opportunity is gone.They only realize it________it is too late.
#30659
A
when
B
before
C
in case
D
until
I have no idea ______ measures the government will take to stop the air from being further polluted.
#30177
A
which
B
what
C
that
D
whose
He failed in the exam, and I wonder ___ he studied hard in the school.
#80339
A
when
B
that
C
if
D
where
