【題目】______customs are difficult to change.
A.Established
B.Establishing
C.Establishment
D.Establish

【答案】A
【解析】考查過(guò)形容詞化了的去分詞作定語(yǔ)。句意：已建立的習(xí)慣很難改變。established adj. “確定的；已制定的，已建立的”，選A。。

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