I won't tell her the answer until she ___ on it for two hours.
A.had worked
B.has been working
C.will have worked
D.will have been working
thank you
人气：255 ℃ 时间：2019-08-19 03:30:58
解答
B.has been working
until引导时间状语从句,用现在表将来,所以没必要用will
因为句子中有for two hours,所以用完成时
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