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
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
B
年代的固定表达形式。