2. 外语
  3. The contract won’t come into effect until it (sign)______by the legal representatives of both parties.

The contract won’t come into effect until it (sign)______by the legal representatives of both parties.

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问题 The contract won’t come into effect until it (sign)______by the legal representatives of both parties.
选项
答案is signed
解析 本题考查被动语态的用法。分析句子结构可知，it指代句中所提到的contract，与动词sign之间是被动关系。被动语态的构成规则是“be+过去分词”，所以空格处应该填入is signed。
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