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

试题分析:考查连词辨析。A除非,如果..不…;B当…时;然而;C既然;D尽管;句意:既然你负责这些信息,你就必须非常当心。根据句意说明C正确。
点评:连词辨析要在上下文语境中进行考查,根据语境语义搭配辨析。本题要注意unless=if…not…。
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