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SAT语法一题Mediators were standing by,prepared to intervene in(A

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SAT语法一题
Mediators were standing by,prepared to intervene in(A) the labor dispute even though(B) both sides had refused(C) earlier offers for(D) assistance.No Error (E)
为什么要把D的for 改成of?
因为这里assistance(帮助)是offer(提供)的内容,不是offer的对象.
争执的双方之前拒绝了提供的帮助.
给你个offer...for ...的例子就清楚了:
比如offer 多少钱for the house,出这些钱买房子,房子是offer的对象