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---Have you heard of Earth Day?
--- Yes, We have only one Earth. We have no choice but ________ it.
A.protectB.protectedC.protectingD.to protect
D

试题分析: 句意:你听过地球日吗?听过,我们只有一个地球,我们除了保护它别无选择。Have后接带to不定式,故选D。
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