73. The British Admiralty and the War Office met in March 1892 to consider a possible Russian attempt to seize Constantinople and how they would have to act militarily to deal with them.
(A) how they would have to act militarily to deal with them
(B) how to deal with them if military action would be necessary
(C) what would be necessary militarily for dealing with such an event
(D) what military action would be necessary in order to deal with such an event（D）
(E) the necessity of what kind of military action in order to take for dealing with it
In choices A and B, the pronoun them has no antecedent; （有代词要想到指代对象，这里无指代对象）furthermore, the if clause in B must take should rather than would. （would /should用词有区别？？？）In C, necessary militarily is awkward and vague. （模糊，笨拙）E is wordy and garbles the meaning with incorrect word order. （词序变动，意思混乱）Choice D is best: its phrasing is clear, grammatical, and idiomatic. Moreover, D is the choice that most closely parallels the construction of the nonunderlined portion of the sentence. The sentence states that the Admiralty and the War Office met to consider x and y, where x is the noun phrase a possible Russian attempt. D provides a noun phrase, military action, that matches the structure of x more closely than do the corresponding noun elements in the other choices. （平行，一个是名词，另一个是名词短语）
furthermore, the if clause in B must take should rather than would. （would /should用词有区别？？？）
171. In 1527 King Henry VIII sought to have his marriage to Queen Catherine annulled so as to marry Anne Boleyn. (A) so as to marry (B) and so could be married to (C) to be married to (D) so that he could marry（D） (E) in order that he would marry The sentence calls for an adverbial clause of purpose to explain why Henry sought the annulment. D, the best choice, does this clearly and correctly. It is introduced by an appropriate conjunction, so that, and contains a logically appropriate verb form, could marry. Awkward and imprecise, A does not specify who is to marry Anne. B substitutes an illogical coordinate predicate for the needed purpose clause; because the annulment had not yet been granted, Henry could not remarry. （句子不完整） C lacks an appropriate conjunction, and the infinitive clause to be married to... makes this choice awkward and unidiomatic. （句子不完整）Although E uses an appropriate conjunction, in order that, the verb form would marry is unidiomatic and illogical (might marry would be better). （????） the verb form would marry is unidiomatic and illogical (might marry would be better). （????）
might/would/ could 上有什么区别吗
谢谢
furthermore, the if clause in B must take should rather than would. （would /should用词有区别？？？）
虚拟语气中对将来的虚拟，从句中用if主语+should/were to，而不是would。在主句中可以用would should might could。
the verb form would marry is unidiomatic and illogical (might marry would be better). （????）
might/would/ could 上有什么区别吗
might是express possibility,would表示将。（个人意见，不足为据，请大家指教）
might / would / should 在一般时态下都可以表达语气；其中
might - 表达‘弱可能性’，相当于may但比may的语气更弱，译成‘可能’；
would - 表达语气如：愿望、请求或建议，或表达一种不确定性，译成‘打算；想’；参见OG152、215解释；
should - 强调职责或义务，相当于ought to，译成‘应该’；参见OG134解释；
附：can/could和able/-able的区别在于前者强调可能性后者强调能力，但是，一般情况下，两者间的区别并不是十分明显，做题时不要过于呆板。
看了很多帖子了，觉得would/should间的分别讲得不是很清楚。这里语感是很重要的。
would/will是表示一个conditional or hypothetical的事情。
shall/should带有建议性，就是OG134说得carries suggestion
may/might比较容易些，表示很弱的可能性。
举些例子：
-- 前几天我爬高，我就对我gf说: If I shall fall, call 911. 如果我真得掉下来了，打911
再看一句will和should一起的。
-- 有一次出差，眼看就要错过飞机了，我就对我同事说: If we shall miss this flight, we will miss the meeting with the client. 如果我们真的错过了这班飞机，我们可能会错过这个会议。
大家可以看到，should表示真有这样事的话怎么怎么，就是OG里说的ought to happen。would表示可能会也可能不会。
-- 再看这题 B: how to deal with them if military action would be necessary. 如果真的要动武的话，应该怎么办。所以OG说要用should
我觉得还是从虚拟语气的用法比较好理解此题
虚拟语气中对将来的虚拟，从句中用if主语+should/were to，而不是would。在主句中可以用would should might could。
should和would均可用在虚拟语气，但有差别，试比较：
would用于虚拟条件句:
If we were men,we would be doing something now.
I would have done more, if I'd had the time.
should用在虚拟条件句:
I should be most happy to go with you if i should not be in the way.
I could presuade her to make room for you should it be necessary.
从上可以看出，would用于虚拟条件句一般表示不太可能发生的事（状况），所以og73 B用would是不太合适的。
harlequin说的比较简洁,我认为是对的
白勇语法书 81页
表示与将来的事实相反,从句的谓语动词用SHOULD +动词原形,主句用should(第一人称)/would(第二\三人称)/could/might+动词原形
谢谢，看来要补补虚拟语气了～～～
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