先感谢关注。看两道例题：
（白勇书上１０７页） OG 70.
A President entering the final two years of a second term is likely to be at a severe disadvantage and often unable to carry out a legislative program.
(A) likely to be at a severe disadvantage and is often unable to
(B) likely severely disadvantaged and often unable to
(C) liable to be severely disadvantaged and cannot often
(D) liable that he or she is at a severe disadvantage and cannot often（A）
(E) at a severe disadvantage, often likely to be unable that he or she can
（白勇书上１３１页）
大全section10
15. Once the economic and social usefulness of the motor car was demonstrated and with its superiority to the horse being proved, much of the early hostility to it in rural regions disappeared.
(A) and with its superiority to the horse being
(B) and its superiority over the horse had been
(C) and its superiority to the horse
(D) its superiority over the horse（C）
(E) with its superiority to the horse having been
这里有几个疑问：首先 第一个例题为什么没有省略掉is ??? 我觉得可以省略。但是白勇说有些时候省略有些时候不能，什么时候不能省呢？
第二题 在白勇的书里是说答案是Ｂ 他认为Ｃ中的and后面部分是短语所以错。但我觉得可以是省略了was的结果啊。是不是他认为 在这里be动词优势不能省略的呢？？
第二题 大全的答案是C 哪么到底是哪个对呢？
请大家帮我看看~谢谢，
be able/unable to是一个整体，有些语法书称之为半助动词，作并列谓语的时候最好不要省略be。
第二题，B应该不对，时态错了。C的助动词省略。
我刚刚做完大全 回头再看白勇的书补漏洞~ 很好的书，不过好像。。。。有几点观点不是很正确～～ 再看看~~ baiyong and lzm的书用来做参考，可以拓宽思路，有些小节不必太计较。
你做的真快。
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