Questions 18 to 20 are based on the following passage.At the end of the passage, you will be given 15 seconds to answer the questions.
Now, listen to the passage. The pyramids were builtA．before theEgyptians developed a sophisticated technology. B．after theEgyptians developed a sophisticated technology. C．to house the tombs of all ancientEgyptian kings and nobles. D．to keep mummies safe forever.
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