--Have you mended your shoes, Bob?

--Yes, I ________ them twenty minutes ago.

1. A.
   have mended
2. B.
   mend
3. C.
   had mended
4. D.
   mended

(2006年天津)

--- Have you mended your shoes, Bob?

--- Yes, I ________ them twenty minutes ago.

[　　]

—Have you mended your shoes, Bob？—Yes, I ____ them twenty minutes ago ．

A．have mended   B．had mended  C．mended  D．mend