______ seems easy in theory seems difficult in practice.A、ThatB、WithC、WhatD、I

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问题 ______ seems easy in theory seems difficult in practice.

选项 A、That
B、With
C、What
D、It

答案 C

解析本题测试主语从句的用法。在本句中由what引导主语从句，在从句中做主语。句子的意思是：“理论上看起来简单的东西在实践上看起来很难。”

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