There are no sharps or flats in the key of C major.

C大调中没有升半音和降半音。

《牛津词典》

And the last one in the major pattern is a half step from B to C.

大调模式的最后，是一个从B到C的半音级。

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The song was written in C-major.

这首歌是用C大调创作的。

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The song was written in C-major.

这首歌是用C大调创作的。

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