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(yǔ)從句的省略。當(dāng)狀語(yǔ)從句的主語(yǔ)與主句的主語(yǔ)一致,且狀語(yǔ)從句中有系動(dòng)詞be的時(shí)候,可以把狀語(yǔ)從句的主語(yǔ)和be動(dòng)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(kāi)車(chē)的時(shí)候,你一定要很細(xì)心。故C正確。
點(diǎn)評(píng):當(dāng)狀語(yǔ)從句的主語(yǔ)與主句的主語(yǔ)一致,且狀語(yǔ)從句中有系動(dòng)詞be的時(shí)候,可以把狀語(yǔ)從句的主語(yǔ)和be動(dòng)詞一起省略。如果狀語(yǔ)從句中有it is的時(shí)候,it is 也可以省略。
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