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GmatKiss
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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!
(A) between passing
(B) of passing
(C) between its passes
(D) of its passes
(E) as it passes
Please explain!












