George would certainly have attended the meeting，__________.?
A．if he didn’t get a flat tireB．if the flat tire hadn’t happened?
C．had he not had a flat tireD．had the tire not flattened itself?
C?
表示對過去情況的假設(shè)，主句動詞形式為would(should，could,might)+have+過去分詞，條件句為過去完成式，if可以省略，但要把had提前主語前面。 B、 D的表達(dá)不符合英語表達(dá)習(xí)慣，所以C是正確答案。?
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