OG preposition must be followed by a noun

有很多可能的L

The personal income tax did not become permanent in the United States until the First World War; before that time the federal government was dependent on tariffs to be their main source of revenue.

• Athe federal government was dependent on tariffs to be their main source of revenue
• Bthe federal government had depended on tariffs as its main source of revenue
• Ctariffs were what the federal government was dependent on to be its main source of revenue
• Dthe main source of revenue for the federal government was dependent on tariffs
• Efor their main source of revenue, tariffs were depended on by the federal government
  

In C and E, on (preposition) is not followed by a noun.
Eliminate C and E.

虽然能选出正确选项，但关于这个解释在选项C的应用不太理解，Tariffes are what the federal government was dependent on.这句话有问题吗...问题不应该在于后面那to be吗 求解答

kluivert

我始终觉得，既然用了before that time ..这样的标志，后面就应该用过去完成时

C tariffs were what the federal government was dependent on to be its main source of revenue
表达太wordy ,awkward ..

to be这里的确不是很明白，觉得太不搭了... 即便改成as我还是觉得太不顺了太太wordy ,awkward
顺求高手解答

曹元成

个人认为时态不是一个很好的判断点因为已经出现了before，不用过去完成时也可以表示时间先后

介词的这个点真的不是很熟练…很多时候不太敢用这个点来判断 我貌似感觉这个C还有倒装？不确定哈

我的判断顺序是词性顺序  动词>形容词副词>名词>动名词  表达歧义越少越简洁 就越优选 这也是一个帮助做排除的点吧

有很多可能的L

kluivert 发表于 2018-8-24 14:38
我始终觉得，既然用了before that time ..这样的标志，后面就应该用过去完成时

C tariffs were what the f ...

这个用meaning理解加上before that time的提示可以判定过去完成时是最优选择 但OG上包括ron还有一些论坛上的资料关于C的解释不太懂 如1楼 “Tariffes are what the federal government was dependent on.”可能我语法比较弱看不出来这有什么问题啊

有很多可能的L

曹元成 发表于 2018-8-26 11:37
个人认为时态不是一个很好的判断点因为已经出现了before，不用过去完成时也可以表示时间先后

介词的这个点 ...

嗯嗯 能选出来B但是具体的这个介词的解释真是困扰我好久了

kluivert

Tariffes are what the federal government was dependent on

football is what I like the best .
I like football the best.

直接，简洁！

football is something that i truly like.
i truly like football