______seems easy in theory seems difficult in practice.

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问题 ______seems easy in theory seems difficult in practice.

选项 A、That
B、With
C、It
D、What

答案D

解析 句意:理论上看起来简单的东西在实践中似乎却很难。名词性从句题。选项中只有what既可以引导主语从句,又充当从句的主语。故选D。
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