4. Sunspots, vortices of gas associated with strong electro-magnetic activity, are visible as dark spots on the surface of the Sun but have never been sighted on the Sun’s poles or equator. (A) are visible as dark spots on the surface of the Sun but have never been sighted on (B) are visible as dark spots that never have been sighted on the surface of the Sun (C) appear on the surface of the Sun as dark spots although never sighted at (D) appear as dark spots on the surface of the Sun, although never having been sighted at (E) appear as dark spots on the Sun’s surface, which have never been sighted on 这道题为什么选c呢，我觉得从时态上看，应该是至今还没有看到过，应该是现在完成时，d好象更合适，请教！
我也觉得不需要完整的句子，我现在觉得是因为被sighted的应该是dark spots,而不是sunspots,所以就近修饰比较好（although之前没有句号就是证据），不知道这样讲通不通。还有appear on the surface as spots更通顺，连贯。 哎，我也不知道了，考试遇到的话估计我肯定选d了。
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发表于 2003-10-29 16:24:00
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