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The earth is our home. It ______________ well.
A.must be protectedB.should protectC.need protectD.need protecting
A

试题分析:句意:地球是我们的家。它应当被保护好。本句的主语是the earth,所以使用被动语态。含有情态动词被动语态的基本形式是:情态动词+be+实义动词的过去分词。
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