Many people have believed that pyramids are found only in Egypt. In
fact, ancient peoples erected their own pyramids throughout Central
America thousands of years ago. The Mayas had built arliest
imerica between 600 and 400 B. C. They were
performing laborato coremonies on their pyramids when ancient
cryptians were using their pyramids as burial tomba, The Mayas had
on thriving for many centuries before the arrival of Europeans
OVE
Find the sentence that expresses past time with a
past perfect progressive form of a verb.
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