XDF旧题2道，谢

以下是引用wikeypig在2003-9-15 17:20:00的发言：
17. Scientists calculated that the asteroid, traveling at
46,000 miles an hour, is on an elliptical path that
orbits the Sun once a year and regularly brings it
back toward Earth.

(A) hour, is on an elliptical path that orbits the Sun
    once a year and regularly brings it
(B) hour, is orbiting the Sun once a year on an
elliptical path that regularly brings it
(C) hour, once a year orbits the Sun, regularly
bringing it on an elliptical path
(D) hour and orbiting the Sun once a year on an
elliptical path, regularly bringing it
(E) hour, orbits the Sun on an elliptical path once a
year and that regularly brings it

答案B，我选D因为觉得B中IT指代不清
21. Promotions, retirements, deaths, and other actions
approved by the board of directors at its May meeting
will be reported in the July 15 issue of the company
paper.

(A) Promotions, retirements, deaths, and other
    actions approved by the board of directors at
    its May meeting will be reported in the July
    15 issue of the company paper.
(B) Promotions, retirements, and other actions
    which have been approved at the May meeting
    of the board of directors along with deaths,
    with be reported in the July 15 issue of the
    company paper.
(C) To be reported in the July 15 issue of the
    company paper are the promotions, retirements,
    deaths, and other actions which were approved at
the board of directors' May meeting.
(D) Meeting in May, the promotions, retirements,
and other actions approved by the board of
directors, including obituaries, will be reported
in the July 15 issue of the company paper.
(E) The July 15 issue of the company paper will
report on promotions, retirements, and other
actions approved by the board of directors at
its May meeting; the paper will also include
obituaries
.答案E，ITS 指代谁？其他选项为什么错？