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________ you have to do the job, you should try your best to do it well even though it may be very difficult for you.

ASince BWhile

CUnless DThough

 

A

【解析】A 考察连词。句义:既然你要做这份工作,就尽力去做。Since既然,while然而;unless除非;though尽管;根据句义说明A正确。

 

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