Iamreluctanttousethestrategy__________itservesaver

I am reluctant to use the strategy __________it serves a very clear purpose.

A． when

B． unless

B． as long as

D． as soon as

正确答案：B
本题考查条件状语从句的逻辑连接词when当……时候；unless除非；aslongas只要；assoonas—…就题干意思:我不愿意采用这个策略除非它目标明确