If you keep on , you’ll succeed .A. in time B. at one time C. at the same timeD. on time

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(答案→)A. in time
B. at one time
C. at the same time
D. on time
解析：考查短语辨析。in time 及时，迟早，at one time 一度，曾经，at the same time 同时，on time 按时，句意：如果你继续，你迟早会成功的。所以选A。