20.
(A) The quality was lower in the Neolithic period when works of tusks and bones became part
of art and craft.
(B) The decline in the Neolithic period resulted in works of tusks and bones becoming part of
art and craft.
(C) Until the Neolithic period, works of tusks and bones had been part of art and craft.
(D) By the Neolithic period, works of tusks and bones had become part of art and craft.
貳、英文寫作
III、第 21 至第 30 題，每題各有一個空格，並各附有四個選項，請依據各題文意
與語法，選出最適當的答案，以完成該句。