17. 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
答案是B，我选得是D！
请问B为什么对？IT好像没有指代对象啊？
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