【題目】In spite of all the efforts __________ these endangered species, many of them have died out over the years.

A. to protect B. protecting

C. protected D. having protected

【答案】A

【解析】句意：盡管為保護(hù)這些瀕危物種做出了努力，但是，多年來仍有許多物種滅絕了。efforts to do sth. 為做某事而做出努力，不定式作定語。

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