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

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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

参考答案:

B本题考查条件状语从句的逻辑连接词。when当……时候;unless除非;as long as只要;as soon as—…就。题干意思:我不愿意采用这个策略,除非它目标明确。