问题

How long do you think it will be _____China becomes a developed country?—At least 20 years, I guess.
A:that
B:until
C:when
D:before
B:until
C:when
D:before
正确答案是:
同类题型
-What is he going to be in the future -_________________.
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Tomorrow ____ my birthdayI’d like you and Jane to come.——I’m not sure if she ____ free
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