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You must be careful when ___ on the highway.
A.you drivingB.are drivingC.drivingD.you were driving
C

试题分析:考查状语从句的省略。当状语从句的主语与主句的主语一致,且状语从句中有系动词be的时候,可以把状语从句的主语和be动词一起省略。本题在when后面省略了you are;句意:当你在高速公路上开车的时候,你一定要很细心。故C正确。
点评:当状语从句的主语与主句的主语一致,且状语从句中有系动词be的时候,可以把状语从句的主语和be动词一起省略。如果状语从句中有it is的时候,it is 也可以省略。
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