Halley's Comet- SC1000 -163

[SmarpanGamt]

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.


(A) between passing
(B) of passing
(C) between its passes
(D) of its passes
(E) as it passes


Please explain ...It was a spolier......... I choose " E". please explain y it is incorrect.

[gmatmachoman]

https://www.beatthegmat.com/halley-s-comet-t37650.html


Stacey has posted her view. Plz check them!