temporary information

Question：He told me that he had handed in his exercise book ______ .

A. two days ago   B. after two days
C. two days before D. in two days



by intuition, i chose A.


and the right answer is.................









C.

★　ago：(自「說話時間」)...前

• I saw her a few minutes ago.

• We went to Madrid two years ago.

 (1)   與過去式同用，不用現在完成式。

  •I started (NOT I've started) a new job a few weeks ago.

(2)   不可和since或before同用。

  • I came to the USA two months ago (NOT since/before two months ago).

(3)   不可在有ago的詞條前使用介詞(at/in/on…等)。

  •They first met fifteen years ago (不可用at/in fifteen years ago).

   
★　before：(自「過去某時間」)...前多久

•His grandfather died five years ago; and his grandmother had already died three years before (that)/previously.

★　previously：用法同before，但較為正式

•The meeting was a follow-up to one that had been held four days previously.