[讨论]XDF两道语法题，请大家一起讨论

2.Oberlin College in Ohio was a renegade institiution at its 1833 founding for deciding to accept both men and women as students.

A.at its 1833 founding for deciding to accept

B for the decision at its 1833 founding to accept

C.when it was founded in 1833 for its decision to accept

D.in deciding at its founding in 1833 to accept

E. by deciding at its founding in 1833 on the acceptance of

我选的C，但答案选的D，为何呀？

14.Sunspots,vortices of gas associated with strong electro-magnetic  activity, are visible as 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 teh 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

I choose  B,but the correct answer is C.Why?

14.

A.Correct.

B.Changing the modifying clause so that that never...Sun distorts(曲解) the meaning of the sentence;the contrast is lose.　

C.Although 后缺少主语，sighted 也不完整