<文意選填>[題組:第21題到第30題]Though details of the century egg’s discovery are undocumented, scientists estimate that it ______ more than 500 years to the Ming Dynasty. (A) provokes (B) exotic (C) delicacy (D) dates back (E) refreshed (F) implies (G) appetizing (H) mixture (I) goes by (J) unchanged (K) challenge (L) favor
