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OG12-14: Sunspots, vortices of gas associated with strong electromahnetic 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 C.appear on the surface of the Sun as dark spots although never sighted at
正解是A。OG对C的解释是although后面要连接一个完整的句子,而这里缺少主语,且sighted也不是一个完整的动词。那我就不明白了,A选项里but也是一个连词,照理说but后面也应该跟一个完整的句子才对啊,可是这里but后面不是也没有主语吗,为什么A就正确了呢??? |
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