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Verbal·Expression of Ideas·Transitions
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As a massive ice sheet advances, its enormous weight presses the underlying crust downward, displacing some of the mantle rock beneath it.        the crust just beyond the ice sheet’s margins is pushed slightly upward, forming a broad ridge that geologists call a peripheral bulge.
Which choice completes the text with the most logical transition?
A
Previously,
B
Simultaneously,
C
In summary,
D
For example,