Don't keep your mouth ___ if you want to improve your spoken English.

  A. shut        B. shutting        C.shutted       D. to shut

A


解析:

keep這里意思是；使保持，后面要求接形容詞用它的賓補(bǔ)，而不是keep sth. from doing.。C、D兩選項(xiàng)不符合題意。

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