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【题目】You should think ________ before making any important decisions. (two)

【答案】twice

【解析】

句意:在做任何重要决定之前你应该三思而后行。

考查习惯用语和谚语。think twice重新考虑,再次考虑,三思而后行,习惯用语。two二,变成两次,再一次。故答案为twice

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