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
It was seven o;clock in the morning ____ he came back.It was really at seven o’clock ___ he came back from work this morning.
#80513
A
that; that
B
when;when
C
when; that
D
that;when
--- Can you tell me how to improve my English? --- Do more speaking, I think , ________you will be good at spoken English.
#31605
A
or
B
for
C
and
D
until
Mary must keep her mind on her medical studies now, so it would be years ______ she could think about marriage.
#32683
A
before
B
when
C
since
D
until
Success is how you are viewed by others, _______ achievement is something you do yourself.
#31899
A
while
B
in case
C
even if
D
as long as