The new system needs to be in operation for five months ________ it can be updated.
#30274
A
as
B
while
C
before
D
once
推荐题目
That dog ought to be destroyed ______ it attacks any more children.
#31233
A
until
B
since
C
after
D
before
Just as too much harmony is tiresome in music,________.
#79945
A
the life of too many benefits annoys us
B
so, in life, too many benefits annoy us
C
we are annoyed with lives also of too many benefits
D
a lot of benefits annoy us in life
—How long do you think it will be ________ we win the football World Cup? —Perhaps twenty years.
#33546
A
when
B
since
C
that
D
before
His promise ___ he would marry her when he came back turned out to be a lie, ___ left the girl heart-broken．
#32621
A
which; what
B
that; which
C
what; which
D
which ; that
Paul had to write a history paper, _____ he couldn’t find time to do it.
#33195
A
but
B
so
C
because
D
if