---We all know that __________ a foreign...

---We all know that __________ a foreign language requires time and effort (努力).

A. learnedB. learn

C. learningD. to learned

C 【解析】试题分析：句意:-我们都知道学习一门外语需要时间和努力。根据句意可知，know后跟的是一个that 引导的宾语从句，我们需填的是从句中的主语，因此应该用动名词的形式来做主语。故选C。考点：考查动名词。

考点分析：

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