---Look!Thedinosaurs’eggs.---Sobig!Doyouknowwhenthey

問題詳情：

 ---Look! The dinosaurs’ eggs .

---So big! Do you know when they ________?

      been lain   B. were lain 

      C. were lay        laid

【回答】

D

知識點：動詞時態

題型：選擇題