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Verbal·Expression of Ideas·Transitions

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With some elements, like selenium, scientists were able to isolate a relatively pure sample of the substance shortly after discovering its existence—but this wasn’t the case with all elements.        the isolation process took a few years. The element molybdenum, for instance, was discovered in 1778 but not isolated until 1781.

Which choice completes the text with the most logical transition?

A

Often,

B

Even so,

C

Similarly,

D

Furthermore,