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Verbal·Standard English Conventions·Boundaries

hard

For the past 20 million years, Earth’s magnetic poles in the far north and far south have remained roughly where they are today. This has not always been the        throughout geologic history, Earth’s magnetic poles have swapped places several times through a process called polar wandering.

Which choice completes the text so that it conforms to the conventions of Standard English?

A

case; though,

B

case, though.

C

case, though;

D

case, though