The new system needs to be in operation for five months _______

 The new system needs to be in operation for five months ________ it can be updated.

#30274

while

before

once

下一题

推荐题目

The teacher talked in a very low voice_____make himself________, clearly.

#34188

in order to; hear

so as not; hear

in order not to; heard

so that to; heard

It’s the first time ______ he has helped us.

#33283

that

before

when

who

_________you’ve known the importance of it, you should try your best to do it.

#33114

So that

Now that

Now then

After that

This study shows that ______language may differ，the order in which young kids learn the parts of speech appears to be the same across different languages.

#31512

since

while

but

Owen wouldn’t eat anything ____________ he cooked it himself

#80675

until

since

unless

while