Sunspots, vortices of gas associated with strong electromagnetic 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
想请教大家为什么有资料说C D选项although后面不完整啊,为什么不能看成状语省略呢,感觉省略条件都满足啊。
附状语省略的条件:
状语从句的省略:
1)两点省略要求: 第一点是毫无疑问的:逻辑主语等于句子主语 第二点也是必须的:从句的谓语必需是be(没要求主句谓语也必需是be!换句话说状从的省略可以看成是省略了一个be),且从句主语和谓语要么同省,要么同留。 2)形式 正确形式: 表示时间/条件/让步的连词(when/while/if/unless/although/evenif) + 形容词短语/-ing短语/-ed短语 错误形式:表示时间/条件/让步的连词 + 介词短语/名词短语 (although just inside the orbit of Jupiter是错的。
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