(2014·兰州高三质检)Our country is developing at an amazing speed，which is________makes me feel so proud.
#30033
A
what
B
why
C
that
D
where
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Although the police thought he was the most likely one, _____ they had no exact proof about it, they could not arrest him.
#32949
A
when
B
until
C
before
D
since
To keep healthy, you should eat any of the food that is offered on the table _______ it is not well cooked.
#31170
A
if
B
until
C
that
D
unless
—Will you go to Mary’s birthday party?—No, ____ invited, I can’t go to it. I’ll be too busy then.
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A
if
B
unless
C
even though
D
when
You shouldn’t accept a gift from a person _____ you don’t know him.
#31530
A
until
B
unless
C
if
D
whether
I had been looking for the book for two days _______ I found it at last.
#30963
A
until
B
when
C
while
D
before