____ has helped to protect the environment is worth praising.

A. Who B. The one

C. Anyone D. Whoever

D

【解析】

試題分析：考查名詞性從句。本句中Whoever充當引導詞，引導主語從句，并在句中做主語。BC兩項可以在句中做主語，但是不能起引導作用。Who可以引導主語從句，但是who一直都有疑問的意思，whoever相當于anyone who。句意：任何一個保護環(huán)境的人都值得表揚。本句并沒有疑問的含義。故D正確。

考點：考查名詞性從句

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