How long will they stay in Graden City? They'll stay there------the end of August,a.for b.until c,when d.at . 如果选? until ,直到?

问题描述:

How long will they stay in Graden City? They'll stay there------the end of August,
a.for b.until c,when d.at . 如果选? until ,直到?

D ,表示直到。
A加一段时间

b.until
他们会一直待到八月底.