The tremendous heat at a star’s core, ______ tremendous gravity, joins the nuclei of hydrogen atoms.

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问题 The tremendous heat at a star’s core, ______ tremendous gravity, joins the nuclei of hydrogen atoms.

选项 A、combined with
B、having combined with
C、combining with
D、being combined to

答案A

解析 combined with此处表示一种一般情况,相当于when(it is)combined with,所以无需时态变化。
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