请问：OG-73

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

(E)  the necessity of what kind of military action in order to take for dealing with it

首先承认答案正确。OG的解释中有一句话是：in choice B, the if clause in B must take should rather than would

我的问题是为什么OG说B中的would就不行而一定要用should呢？谢谢！

情态词

would表示类似许诺的语气，比如：想...；打算...；或表达可能性语气；

should表示类似命令性语气，比如：应该...；相当于ought to

我的看法是，consider的后面接的是名词词组，而且其中有and，想当然耳是平衡两个名词词组，既是名词，就该是CD选一个，AB就该直接删除，至于would/should的区别，纯粹是ETS凡题目只解一半的惯有作法，我倒不认为是因为would/should的区别导致B错而选D，但 B为何错，呵呵，ETS没有明说罢了

不知对错，请大家指教

D里面哪有if从句啊，只有B里面有嘛。

if从句两个考点，经常考到：

1.if从句一般来说必须用一般现在时（if部分）和一般将来时：if x happens, y will happen。

2.还有一种情况if语句用if x should do y。此时必须是情态动词should，且should不能省略。

多谢携隐MM！再清楚不过了！

请问，提中：attempt to是做n，与a possible russian 构成：consider X Y结构，

                     还是做 V 呢？

可否分析一下该句的结构，并解释一下呢？谢谢