问题描述：
[单选]
掌握一门外语很难，但值得付出努力。．
A．It is difficult to master a foreign language, but it needs to make effort.
B．It is difficult to master a foreign language, but it takes to make effort.
C．It is difficult to master a foreign language, but it pays to make efforts.
D．It is difficult to master a foreign language, but it spends to make efforts.
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