Question

You will never gain success________ you are fully devoted to your work.

A．when

B．because

C．after

D．unless

Answer 1

D

试题分析：考查连词用法。A. when当…..时候；B. because因为；C. after在……之后；D. unless除非，引导条件状语从句。句意：你将永远不会获得成功，除非你完全投入到你的工作。故D正确。