Erosion that is a slow process, but it constantly changes the features on the surface of the earth.

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问题 Erosion that is a slow process, but it constantly changes the features on the surface of the earth.

选项 A、which is
B、although
C、being
D、is

答案D

解析 本句是由but连接的并列结构,前后均应有完整的主谓结构,划线部分中的that使前句成为一个从句,去掉它则句子成立,因此D为答案。
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