Water can ( ) rocks after a long time, even though the rock is harder. ( 章节：3 难度：3)
- A、put away
- B、wear away
- C、be exposed to
- D、bring back
正确答案:B
答案解析:有
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Water can ( ) rocks after a long time, even though the rock is harder. ( 章节：3 难度：3)
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