Question

新概念3lesson44的里的一道题，高分求助高手快来

In addition, it ______ their being the most expensive form of transport. (1. 19)
a．has been a grave disadvantage
b．is the great disadvantage that
c．is a great disadvantage
d．has been the great disadvantage of
为什么不能选d啊，选d的话哪里错了，为什么选c
t is not uncommon to hear ______ a claim for…(11. 7-8)
a．of a shipping company making b．a shipping company to have made
c．the shipping company which has made d．a shipping company making
为什么C和b以及d不对呢，这是新概念3lesson43课的课后题，我觉得其他几项都对啊
如果单从语法上来分析没有错误吧

Answer 1

先说第一个题吧，要首先学会断句，从there being 开始后面看成一个整体句子，是个从句，of是介词后面怎么能跟句子呢，实际上C答案后面省略了一个that，结构是it's a great disadvantage/advantage that＋句子。
再看第二个题，考点是hear的用法，其结构有hear sb./sth. do/doing,后面是不跟to do的不定式的，如果动作正在发生就用doing，若是瞬时动词则用do
希望对你有所帮助

Answer 2

being是个分词，后面这一半是修饰disadvantage的，d选项与句意不符
hear of是个短语，意思是 听说