It puzzles the scientists _____ some mammals produce their young _____ others lay eggs.
#30772
A
that; while
B
what; while
C
that; as
D
what; as
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(2014·河南豫北三校高三下学期联考)Honesty is a virtue________greed is an evil，as the saying goes.
#30035
A
while
B
when
C
as
D
and
He is so busy. He cannot afford enough time with his son _______ he wants to.
#31186
A
even if
B
as if
C
because
D
before
The police officers in our city work hard ______ the rest of us can live a safe life.
#32902
A
in case
B
as if
C
in order that
D
only if
Several weeks had gone by _______ I knew the painting was missing.
#32417
A
as
B
since
C
until
D
before