---How long do you think it will be _____China becomes a developed country?
---At least 20 years, I guess.
A．thatB．untilC．whenD．before
D.
it+段時間+before… 句型意為：要過多久才……。所在句意為：你認為中國要過多久才能成為一個發(fā)達國家。It …until…意為“直到……才……”與句意不合。
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