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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;AD沒有用被動語態也不選;本題用過去分詞作賓補。


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