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Having an outdoor meal is always fun, but it can also be damaging to the planet if ______.
A.planned not carefullyB.not planning carefully
C.not planned carefullyD.not to be planned carefully
C

试题分析:考查省略句。当状语从句的主语和主句的主语一致,且状语从句中有be动词的时候,可以把状语从句的主语和be动词一起省略。本题在if后面省略了it is。句意:出去吃饭也行有有趣。但是如果没有被仔细计划,它也可能回破坏我们的地球。故C正确。
点评:。当状语从句的主语和主句的主语一致,且状语从句中有be动词的时候,可以把状语从句的主语和be动词一起省略。
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