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63. 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
看了原来的一些讨论，还是不明白为什么是C呢？
interval between是固定用法，但是between是介词，后面怎么可以加its passes主谓结构？为什么A不对呢？
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