He began to learn English___ A in the 1980s B in the 1980 C in 1980's D in 1980s

问题描述:

He began to learn English___ A in the 1980s B in the 1980 C in 1980's D in 1980s

A

A 正确。20世纪八十年代。
B不对,因为具体年份前不能加定冠词。
C D 不符合正确表达法。

D in 1980s 或A in the 1980s可以 .但是A in the 1980s更常见