题目内容

What is the best way you think of ______ the environment?
A．to protectB．protectingC．protectD．protected
A
动词不定式做后置定语表示一次性的动作，现在分词做后置定语表示反复发生的动作，过去分词作后置定语表示发生过的动作，原形动词不能用作后置定语，根据题意选A。你认为什么是保护环境的最好的方法？
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