You mustn’t lose heart; sooner or later your efforts will A. pay offB. take offC. give of

问题补充：

You mustn’t lose heart; sooner or later your efforts will ．

A. pay off

B. take off

C. give off

D. set off

答案：

(答案→)A. pay off

B. take off

C. give off

D. set off

解析：考查词组辨析：A．pay off还清，成功，B．take off起飞，脱下C．give off散发， D．set off启程，句意是：你不要灰心，你的努力迟早会有回报。选A。