2. 外语
  3. AMost tree frogs Bchange colors Cfrom time to time to fit in with Dits environment.

AMost tree frogs Bchange colors Cfrom time to time to fit in with Dits environment.

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问题 AMost tree frogs Bchange colors Cfrom time to time to fit in with Dits environment.
选项
答案D
解析 应改为their。前后对应，tree frogs，所以应为复数。
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