第一题填would have caused这题考查虚拟语气的用法,与过去相反的假设,虚拟条件句为If+主语+had +过去分词也就是题目的If the foundation had...,主句就用：主语＋should,would,might,could＋have done,答案是would have caused
第二题答案是compared,被动语态
英语 If the foundation had not been strengthened 3 years ago,t
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