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.
我覺得是c