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Geologists once thought that the molten rock known as lava [#permalink]
 16 Jul 2007, 18:49
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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
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Good link to follow!
The previous post has good insights, though this particular SC was tough all around!
The answer is A, the original structure.
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Nice link.
Absolutely the key is to check the modifier and the tense structure. This one is simple past and present.
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