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_______you’ve tried it, you can’t imagine how pleasant it is. 
#30905
A
Unless
B
Because
C
Although
D
When
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 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
You should not go rafting ________ you know how to swim.
#31441
A
if
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if not
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—Why didn’t you tell him about the meeting?—He rushed out of the room _____ I could say a word.
#79828
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before
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until
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after
(2013·莱州一中期末检测)He didn't expect that his parents could manage to know ________ is going on in his college life on the Internet.
#30536
A
how
B
which
C
what
D
that
What an unforgettable experience! I’ll write it down _______ it is still fresh in my memory.
#34758
A
since
B
after
C
while
D
until
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