He began to work there .
A: on his fifty
B: at age of fifty
C: when he fifty
D: in his fifties
A: on his fifty
B: at age of fifty
C: when he fifty
D: in his fifties
举一反三
- He began to work there in _______ . A: his fifty B: his fifties C: age of fifty
- He began to work there in his _______ . A: fifties B: fifty C: fiftieth D: the fiftieth
- It’s never too old to learn. Karl Marx began to learn Russian in his ______. A: the fiftieth B: fiftieth C: fifty D: fifties
- 中国大学MOOC: He is over fifty, but he looks as though he ______ only in his thirties.
- He is over fifty, but he looks as if he（）only in his thirties. A: is B: were C: will be D: has bee