Nana: Did you mail the cards to your teachers? Annie: No, I want to check them again. I ________ them after dinner.
(A) mailed(B) mail(C) have mailed(D) will mail 為什麼答案是D? Nana不是用did問嗎？did是過去式，那回答也要用過去式不是ㄇ？
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