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题库 / Prep2007E1-SC-86
An international team of astronomers working at telescopes in the Canary Islands and Spain has detected at least 18 huge gas spheres estimated to have 5 to 15 times the mass of Jupiter, the solar system's largest planet.
astronomers working at telescopes in the Canary Islands and Spain has detected at least 18 huge gas spheres estimated to have 5 to 15 times the mass of Jupiter
astronomers working at telescopes in the Canary Islands and Spain has detected at least 18 huge gas spheres estimated to be 5 to 15 times Jupiter's mass
astronomers is working at telescopes in the Canary Islands and Spain, having detected at least 18 huge gas spheres that are estimated at 5 to 15 times the mass of Jupiter
astronomers, working at telescopes in the Canary Islands and Spain, and has detected at least 18 huge gas spheres estimated at 5 to 15 times the mass of Jupiter
astronomers, working at telescopes in the Canary Islands and Spain, has detected at least 18 huge gas spheres they have estimated to be 5 to 15 times Jupiter's mass
D and前面不是完整句子
C having detected 错误 work at telescopes和detect之间没有因果关系，同时Comma + ING的形式需要前后动作在同一个timeframe，前面是现在进行时，后面是现在完成时，不正确。
简洁明了的解释登录 或 注册 后可以参加讨论
to be错了。因为，这18个gas sphere是被估计“拥有”15倍的质量，不能说“10个sphere是15倍的质量”（也就是说，气团只能有质量，但是气团不能是质量）。所有格是没有问题的。登录 或 注册 后可以参加讨论