It’s said that corn was grown a lot in Tibet . A. in 17th century B. in the 17th

It’s said that corn was grown a lot in Tibet _______.

　 A. in 17th century 　 B. in the 17th century

　 C. in 17 century 　 D. in the 17 century

试题答案

B

年代的固定表达形式。