---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

試題分析: 句意：你聽過地球日嗎？聽過，我們只有一個地球，我們除了保護它別無選擇。Have后接帶to不定式，故選D。
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