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

試題分析：考查省略句。當(dāng)狀語(yǔ)從句的主語(yǔ)和主句的主語(yǔ)一致，且狀語(yǔ)從句中有be動(dòng)詞的時(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if后面省略了it is。句意：出去吃飯也行有有趣。但是如果沒(méi)有被仔細(xì)計(jì)劃，它也可能回破壞我們的地球。故C正確。
點(diǎn)評(píng)：。當(dāng)狀語(yǔ)從句的主語(yǔ)和主句的主語(yǔ)一致，且狀語(yǔ)從句中有be動(dòng)詞的時(shí)候，可以把狀語(yǔ)從句的主語(yǔ)和be動(dòng)詞一起省略。
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