Season 3——manhattan 54 （已点评）

winghyy

选A
1.根据 G once thought that...but they know that it is, 对比用一般过去时was，排除BD
2. C, which 错误修饰，会引起歧义以为修饰an underground remnant
3 . E.having sporadically erupted 错误，不需要用完成时，sporadically erupt 是一种现象

corneliaflower

54. Geologists once thought that the molten rock known as lava was an underground remnant of Earth's earliest days, sporadically erupting through volcanoes, but they now know that it is continuously created by the heat of the radioactivity deep inside the planet.

A   was an underground remnant of Earth's earliest days, sporadically erupting

B   had been an underground remnant of Earth's earliest days and sporadically erupted

C   was an underground remnant of Earth's earliest days, which sporadically erupted

D   would be an underground remnant of Earth's earliest days that sporadically erupted

E   was an underground remnant of Earth's earliest days, having sporadically erupted

选A
首先根据一般过去时态排除BD
其次having sporadically erupted 错误
AC纠结了一下
underground remnant of Earth's earliest days中得of 是表示从属还是时间呢？ 觉得还是从属关系
所以which sporadically erupted紧邻修饰days错

laiweizhou

同样也是是纠结在AC
但最后觉得选C
诚然 主系表结构，可以对宾语进行描绘和解释。 好像OG 有一题是 选protecting. 但A选项相对比较复杂。erupting 的逻辑主语真的不是很清晰，而且好像在此句中做伴随发生不是很好。

C中which 可以修饰不可拆分的整体underground remnant of Earth's earliest days。 另外在此句中用which地非限制性定语从句做修饰，比ing做伴随或者解释要好。

balapupu

Geologists once thought that the molten rock known as lava was an underground remnant of Earth's earliest days, sporadically erupting through volcanoes, but they now know that it is continuously created by the heat of the radioactivity deep inside the planet.

A   was an underground remnant of Earth's earliest days, sporadically erupting-->R

B   had been an underground remnant of Earth's earliest days and sporadically erupted-->过去完成时木有意义。且ed形式木有Ing形式更好的表示状态。。

C   was an underground remnant of Earth's earliest days, which sporadically erupted-->which有指代days的歧义.

D   would be an underground remnant of Earth's earliest days that sporadically erupted-->不是表示对将来的推测，语气错。

E   was an underground remnant of Earth's earliest days, having sporadically erupted-->having 冗余