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

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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