请教大全227，229和234

227.Coronary angiography, a sophisticated method for diagnosing coronary disease involving the introduction of a dye into the arteries of the heart, is now administered selectively, because it uses x-rays to observe cardiac function.

(A) for diagnosing coronary disease involving the introduction of a dye into the arteries of the heart, is now administered selectively, because it uses

(B) for diagnosing coronary disease involving the introduction of a dye into the arteries of heart, is now administered selectively, because of using

(C) for diagnosing coronary disease, involves the introduction of dye into the arteries of the heart and is now administered selectively, because it uses

(D) to diagnose coronary disease that involves the introduction of a dye into the arteries of the heart, is now administered selectively, because it uses（C）

(E) to diagnose coronary disease involving the introduction of a dye into the arteries of the heart, which is now administered selectively, uses

227的method for doing可以这样用吗？我觉得是method to do 所以连题都没看就把前三个排除了呢，结果中计拉。

229 Crises in international diplomacy do not always result from malice; for nations, like individuals, can find themselves locked into difficult positions, unable to back down.

(A) do not always result from malice; for nations, like individuals, can find

(B) do not always results from malice; nations, just as individuals, finding

(C) do not always results from malice; nations, such as individuals, can find

(D) aren’t always the results of malice; nations in the same way that individuals can find（A）

(E) aren’t resulting always from malice; just like individuals who can find

229这里a的结构是在看不懂啊，for是介词还是连词哦？也是我的坏习惯，觉得有分号，应该是主语，所以就把a排除了呢。