If you keep on you will succeed .A. in timeB. at one timeC. at the same timeD. on time

问题补充：

If you keep on, you will succeed .

A. in time

B. at one time

C. at the same time

D. on time

答案：

(答案→)A. in time

B. at one time

C. at the same time

D. on time

解析：考查介词短语。A及时，迟早；B曾经；C同时；D准时；句意：如果你继续努力，你迟早会成功的。根据句意说明A正确。