单选题
A
Native to
South America B
and cultivated
there for thousands of years, the peanut C
is said
to D
have introduced
to North America by early explorers.
【正确答案】
D
【答案解析】解析：have introduced一have been introduced。句意：花生原产于南美，在那儿种植了几千年，据说它是由早期北美探险家引入南美的。从句意可以判断，the peanut和introduce之间是被动关系，即花生是被引入南美的，故introduced之前添加been。