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
I won't tell her the answer until she ___ on it for two hours.
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
A.had worked
B.has been working
C.will have worked
D.will have been working
thank you
英语人气：586 ℃时间：2019-08-19 03:30:58
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