两个关于助动词补出的问题

Fsimple

大全528 Never before in the history of music have musical superstars been able to command so extraordinary fees of the kind they do today.

(A) so extraordinary fees of the kind they do today

(B) so extraordinary fees as they are today

(C) such extraordinary fees as they do today

(D) such extraordinary fees of the kind today’s have（C）

(E) so extraordinary a fee of the kind they can today
这句正过来是不是应该是no superstars have been able to command so extraordinary fees as they (are able to command) today. 那么as后应该用they are, 为什么答案用they do?








比较大全729, 补出的动词的是can,而不是do(对应deliver),这种情况该如何判断指代对象呢?
729.The development of a new jumbo rocket that is expected to carry the United States into its next phase of space exploration will be able to deliver a heavier load of instruments into orbit than the space shuttle and at a lower cost.

(A) The development of a new jumbo rocket that is expected to carry the United States into its next phase of space exploration will be able to deliver a heavier load of instruments into orbit than the space shuttle and at a lower cost.
(B) The development of a new jumbo rocket is expected to carry the United States
into its next phase of space exploration and be able to deliver a heavier load of instruments into orbit at a lower cost than the space shuttle.
(C) The new development of a jumbo rocket, which is expected to carry the United States into its next phase of space exploration, will be able to deliver a heavier load of instruments into orbit at a lower cost than the space shuttle.
(D) A newly developed jumbo rocket, which is expected to carry the United States into its next phase of space exploration, will be able to deliver a heavier load of instruments into orbit than the space shuttle can, and at a lower cost.
(E) A newly developed jumbo rocket, which is expected to carry the United States into its next phase of space exploration, will be able to deliver a heavier load of instruments into orbit than the space shuttle and to cost less.
the key: D

Fsimple

这么棘手的问题。。。大家有没有人帮帮忙啊

spoiledchild

同惑，等nn解答

Fsimple

有没有人帮忙解答下~~感激不尽！

mongmong

帮顶，这两题都不会

第一题和你的困惑一样，
第二题为啥不选E。