________ you are responsible for the information, you must be very careful.
A．UnlessB．WhileC．SinceD．Though
C

試題分析：考查連詞辨析。A除非，如果..不…；B當…時；然而；C既然；D盡管；句意：既然你負責這些信息，你就必須非常當心。根據(jù)句意說明C正確。
點評：連詞辨析要在上下文語境中進行考查，根據(jù)語境語義搭配辨析。本題要注意unless=if…not…。
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