题目内容

         seems to be one of the main reasons for many people        in today’s world.
A．Having an adventure; to travelB．To have an adventure; traveling
C．Have an adventure; to travelD．To give an adventure; traveling
A
        seems to be one of the main reasons for many people句中缺少主语，排除C;而不定式作主语表示具体的一次行为，本句是泛指冒险这一行为，所以也排除B和D。选A。
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