<p>In BB2, page 472 #26
Mediators were standing by, prepared to to intervene in the labor dispute even though both sides had refused earlier offers for assistance.</p>
<p>thank you, grammatical explanation is appreciated</p>
<p>May I ask what the actual answer is?</p>
<p>The answer is D.</p>
<p>“for” should be changed to “of”.</p>
<p>Harambee is correct.</p>
<p>is “of assistance” an idiom?</p>
<p>no. an idiom is an expression. they vary from region to region. “pushing up daises” is an idiom. etc.</p>
<p>Why doesn’t for assistance work?</p>
<p>Because it’s unidiomatic.</p>
<p>for is simply not the best preposition to use in this case.</p>