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英语语法Many meteorites are thought to have originated from ___

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英语语法
Many meteorites are thought to have originated from
___ that once existed between the orbits of Mars and Jupiter.
(A) where aplanet or planets
(B) a planet orplanets so
(C) which a planet or planets
(D) a planet orplanets
正确答案选C但是不明白为什么不能选D?求教,
我也不知道是不是正确答案选C了,答案找不到了.哪个是正确的?
英语语法Many meteorites are thought to have originated from ___
D
Many meteorites are thought to have originated from
a planet or planets that once existed between the orbits of Mars and Jupiter.
翻译:许多陨石被认为是来自曾经存在于火星与木星之间的某一颗或某些行星.
希望对你有所帮助.