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Verbal·Standard English Conventions·Boundaries
easy
The theory of plate tectonics explains how large pieces of Earth’s crust, called tectonic plates, move and interact. According to the theory, the movement of tectonic plates forms        creates volcanoes, and causes earthquakes.
Which choice completes the text so that it conforms to the conventions of Standard English?
A
mountains.
B
mountains
C
mountains,
D
mountains-