Q24: Because Halley's comet changes orbit slightly during the seventy-six-year interval between passing close to Earth, it may veer onto a collision course with a planet sometime in the distant future.
(B)of passing
(C)between it passes
(D)of its passes
(E)as it passes
Ans: (C)
我想請問"between it passes close to Earth"在這個句子裡的功能?
Thank you!!!