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请问IT 在考试是不是一定要所具体指代的对象, 不可能出现形式主语的情况?以下这俩个句子中, IT的作用又有什么不同呢?
1. Although just inside the orbit of Jupiter, amateur astronomers with good telescopes should be able to see the comet within the next few weeks.
(A) Although just inside the orbit of
(B) Although it is just inside the orbit of
(C) Just inside the orbit of
(D) Orbiting just inside
(E) Having orbited just inside
2. Although aspirin irritates the stomach, it can be avoided if the aspirin tablet is given a coating that will not dissolve until the tablet reaches the intestine.
(A) Although aspirin irritates the stomach, it
(B) The irritation of the stomach caused by aspirin
(C) The fact that aspirin causes irritation of the stomach
(D) Aspirin causes stomach irritation, although it
(E) Aspirin irritates the stomach, which | 
