2. 外语
  3. Most geologists believe ______ from the remains of tiny marine plants and animals that died millions of years ago.

Most geologists believe ______ from the remains of tiny marine plants and animals that died millions of years ago.

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问题 Most geologists believe ______ from the remains of tiny marine plants and animals that died millions of years ago.
选项 A、what was formed petroleum
B、that petroleum was formed
C、when petroleum formed
D、petroleum that formed
答案B
解析
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