AR15J wrote:
Thanks Mike for the wonderful explanation, but RMD001's question made me remind of the rule I learned in e-gmat course.
Incorrect usage of past perfect:
use past perfect only to express the sequencing of two related events
Recently scientists learned about the changes in the earth that had happened during the last ice age-- marked incorrect
The reason why above two events are incorrect-- because these are two unrelated events.
Please guide on the above example.
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