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Don’t keep your mouth ________ if you want to improve your spoken English.

[　　]

A．shutting
B．shut
C．shutted
D．to shut

答案：B
解析：

shut的過去分詞仍然是shut，所以C項不選；A、D沒有用被動語態(tài)也不選；本題用過去分詞作賓補。


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