3 题句子改错老题请教![请求]

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请教解释! 谢谢!

23.Because Halley’s comet changes orbit slightly during the seventy-six-year interval [U]between passing[/U]  close to Earth, it may veer onto a collision course with a planet sometime in the distant future
(A) between passing
(B) of passing
(C) between its passes
(D) of its passes
(E) as its passes
A):C

26.Some biographers [U]have not only disputed the common notion that Edgar Allan Poe drank [/U]  to excess but also questioned whether he drank at all.
(A) have not only disputed the common notion that Edgar Allan Poe drank to excess but also questioned whether he drank
(B) not only have disputed the common notion that Edgar Allan Poe drank to excess but also over whether he drank
(C) have disputed not only the common notion that Edgar Allan Poe drank to excess but also whether he may not have drunk
(D) not only have disputed the common notion that Edgar Allan Poe drank to excess but also questioned whether or not he had drank
(E) have disputed the common notion not only that Edgar Allan Poe drank to excess but also questioned whether he may not have drunk
A):A

9. A “standard candle” is a light source whose intrinsic luminosity is [U]so well known that the extent to which its brightness has been dimmed by distance can [/U]  be used as an astronomical yardstick.
(A) so well known that the extent to which its brightness has been dimmed by distance can
(B) so well known that the extent of its brightness that is dimmed by distance can
(C) sufficiently well known so that the extent that distance has dimmed its brightness can
(D) sufficiently well known for the extent of its brightness that has dimmed by distance to
(E) sufficiently well known for the extent that distance has dimmed its brightness to
A):A