163. 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 (between is used as either 1) between A and B or 2) between + plural nouns) so the "between passing close to Earth" is unidiomic
(B) of passing
(C) between its passes Between is better than "of" here, cux some key words, orbit, interval
(D) of its passes(C)
(E) as it passes |