Question

【题目】You will never gain success ______ you fully put your effort into your work.

A. although B. unless C. if D. because

Answer 1

【答案】B

【解析】句意：除非你全身心地投入到工作中去，否则你永远不会成功。考查连词辨析题。A. although尽管，表让步；B. unless除非，表条件；C. if如果，表条件；D. because因为，表原因。本句是条件状语从句，根据句意语境，可知if不合句意，故选B。