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选择题PeopleworkinginthereservesaredoingeverythingtheycanthesebirdsAprotectBprotectingCtoprotectingDtoprotect求指教,八年级题目,已知选D,不知原因!

题目详情
选择题People working in the reserves are doing everything they can______these birds
A protect B protecting C to protecting D to protect
求指教,八年级题目,已知选D,不知原因!
▼优质解答
答案和解析
这里动词不定式用作目的状语