________ you have to do the job, you should try your best to do it well even though it may be very difficult for you.
A．SinceB．While
C．UnlessD．Though
A
A 考察連詞。句義：既然你要做這份工作，就盡力去做。Since既然，while然而；unless除非；though盡管；根據(jù)句義說明A正確。
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