2016-2017学年人教版必修四 Unit3 A taste of English humour language points课件 (17)-302edu教育资源网

up to now: until now 直到现在；直到此刻，多用于现在完成时。

直到此刻他仍保持沉默。直到现在都没人能解出这个问题。

Up to now he has been quiet. Up to now nobody has been able to work out this problem.

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