In the past several years, astronomers have detected more than 80 massive planets, most of them as large or larger than Jupiter, which circle other stars.
most of them as large or larger than Jupiter, which circle
most of them as large or larger than Jupiter and circling
most of them at least as large as Jupiter, circling
mostly at least as large as Jupiter, which circle
mostly as large or larger than Jupiter, circling
mostly 为副词,变成修饰Detected, 语义不通。D项which circle,因为是非限定性定从需要紧跟被修饰的名词,所以变成修饰Jupiter, 那就应该是which circles.
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