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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,