－Sir，may I borrow some new books?－Sorry，you can't________you haven't turn back those you borrowed one month ago.
#30673
A
unless
B
before
C
because
D
until
推荐题目
The professor, _____ some of his assistants, _____ to attend our discussion this afternoon.
#32789
A
and; is
B
as well as; is
C
or; are
D
except for; are
Life is like a long race___ we compete with others to go beyond ourselves.
#33091
A
why
B
what
C
that
D
where
Native English speakers can understand each other __________ they don’t speak the same kind of English.
#33610
A
as if
B
even if
C
if
D
unless
_______ a small number of Australians are bitten by spiders each year, most recover without any medical treatment.
#31526
A
While
B
Unless
C
When
D
Because