9 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.
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
OG上答案是A，自然是没有错误。
可是C错在哪里了呢？
我认为although(they are) never sighted at，可以看成省略了they are.
更可怕的是今天我在网上发现有人给出的答案就是C，
解释如下
Know the idiom "appear .... as"
and not "visible..... as"
Having said that, Choice C, D and E stand in line.
Choice E is obviously wrong as it seems to suggest "surface is sighted on The Sun's poles and equator.
Choice D is wrong, since the usage of "having" a participle is inappropriate and awakward here.
Left Choice C, the correct answer is clear and concise and makes proper usage of idiom "appear ... as".
Well, i know i havent explained the question in that detail. But it would be good if you come out with specific questions, which would help you understand the mistakes on your own.
请各位NN不吝赐教！！！
我觉得是逻辑问题.答案还是A.这里要说的意思是可以在太阳表面上看到黑子,但是没在太阳的赤道和两极看到过黑子.
如果选C就是虽然没在太阳的赤道和两极上看到黑子,但是可以在太阳表面看到.如此说来难道太阳的赤道和两极不在太阳表面上了?
"As conjunctions, although and though
are generally interchangeable: Although (or though) she
smiled, she was angry.
Although is usually placed at the beginning
of its clause (as in the preceding example), whereas though may occur
elsewhere and is the more common term when used to link words or phrases"
http://en.wiktionary.org/wiki/although
这个题目原来看过,记得不是很清楚,但是应该有这样几点可以考虑:
1. appear 和 be visible的差异
前者是自己呈现, 和逻辑意思不相符, 我们观测到是黑子不代表它本身就是呈现出黑色
2. as dark spots应该和动词紧密相连, 这样使逻辑更加清晰
3. 省略结构一定要有相应的语法一致的表达
如果选C,前文没有 N+BE的形式,又如何省略呢?
这个题目前人有很多讨论,答案没有问题 ^_^
原句的完成时态优于你省略的一般现在时，介词on优于at
昨天问了一下语法老师。如是说。
感谢上面几位的指点。
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