题目内容


---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+段时间+before… 句型意为：要过多久才……。所在句意为：你认为中国要过多久才能成为一个发达国家。It …until…意为“直到……才……”与句意不合。
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