9. Sunsports, vortices of gas associated with strong electromagnetic acitivity, 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
答案选A 解释是
This sentence clearly and correctly draws a contrast betwwen where sunspots are found and where they are not.
15. The Iroquois were primarily planters, but supplementing their cultivation of maize,squash ,and beans with fishing and hunting
B and had supplemented C and even though they supplementd D although they supplemented E but with supplementing
答案选D 而对于A的解释是The construction using supplementing fails to support the intended meaning of the sentence
问题是，比较两句，发现都是 are ..... but。。。的形式， 不同点在于，第一个句子后but加出了第二个动词，对了，而第二句句子没有加出而是延续，这是否就说明but只有在补出动词的情况下才能延续起转折，否则不行？
自己顶
but supplementing their cultivation of maize
不通啊，没有谓语动词...
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