You must be careful when ___ on the highway.
A．you drivingB．a(chǎn)re drivingC．drivingD．you were driving
C

試題分析：考查狀語從句的省略。當(dāng)狀語從句的主語與主句的主語一致，且狀語從句中有系動詞be的時候，可以把狀語從句的主語和be動詞一起省略。本題在when后面省略了you are；句意：當(dāng)你在高速公路上開車的時候，你一定要很細(xì)心。故C正確。
點評：當(dāng)狀語從句的主語與主句的主語一致，且狀語從句中有系動詞be的時候，可以把狀語從句的主語和be動詞一起省略。如果狀語從句中有it is的時候，it is 也可以省略。
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