托福考试

【单选题】Most geologists believe ______ from the remains of tiny marine plants and animals that died millions of years ago.
A、what was formed petroleum
B．that petroleum was formed
C．when petroleum formed
D．petroleum that formed

网考网参考答案：B
网考网解析：
暂无解析 document.getElementById("warp").style.display="none"; document.getElementById("content").style.display="block"; 查看试题解析出处>>