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Verbal·Expression of Ideas·Transitions

easy

In 1929, scientists first isolated a sample of the steroid hormone progesterone, which they knew existed in animals—and, they assumed, only in animals. __________ researchers would find progesterone in corn plants (Zea mays), but this discovery wouldn’t come until decades later.

Which choice completes the text with the most logical transition?

A

In other words,

B

For example,

C

Eventually,

D

Earlier,