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答案選 D。be of much help 的意思是 be very helpful（很有幫助），類似的還有：　　

be of much use = be very useful　　

be of great importance = be very important 　　

《中學(xué)英語(yǔ)高頻詞說(shuō)解詞典》的of詞條對(duì)此所作解釋如下：　　

of 與某些名詞（如help, value, interest, importance等）連用，相當(dāng)于形容詞，可用作定語(yǔ)或表語(yǔ)。如：　　

It’s not of much value. 這沒有多大價(jià)值。　　

This subject is of great interest to me. 這門學(xué)科對(duì)我來(lái)說(shuō)是很有趣的。　　

The dictionary is of much help to the students. 這本字典對(duì)學(xué)生幫助很大。　　

你提到的對(duì)話的意思是：　　

--I am sorry. That wasn't of much help. 對(duì)不起，那沒有多大幫助。　　

--Sure it was. And it was most helpful. 當(dāng)然幫助了，非常有幫助。