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
C: most of them at least as large as Jupiter, circling ....
可以看成是省略了being的独立主格,做伴随状语。那么因此circling的主语就是most of them,而不是Jupiter
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