2. 专升本
  3. ______seems easy in theory seems difficult in practice.

______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看起来很难。名词性从句题。选项中只有what既可以引导主语从句，又能充当从句的主语。故选D。
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