It's necessary for him to change water every day.{改为同义句} He___change water every day.

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It's necessary for him to change water every day.{改为同义句} He___change water every day.
It's necessary for him to change water every day.{改为同义句} He___change water every day.

It's necessary for him to change water every day.{改为同义句} He___change water every day.
need 需要