the problem looks ____(easy) ,but it's hard to solve.用适当的形式填空-------

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the problem looks ____(easy) ,but it's hard to solve.用适当的形式填空-------
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the problem looks ____(easy) ,but it's hard to solve.用适当的形式填空-------
the problem looks ____(easy) ,but it's hard to solve.
用适当的形式填空-------

the problem looks ____(easy) ,but it's hard to solve.用适当的形式填空-------
easy