It's never too old to learn.Karl Marx began to learn English in his ________.
A.the fiftieth B.fiftieth C.fifty D.fifties
It's never too old to learn.Karl Marx began to learn English in his ________.
A.the fiftieth B.fiftieth C.fifty D.fifties
D “in+one's+整十基数词复数”表示“在某人几十多岁时”,故选D。