1) I...... Machu Picchu yet. a) hasn't visited b) haven't visited 2) Archaeologists still...... why people ... a) not have guess b) haven't guessed 3) people ..... in ancient city a) have lived b) has living 4) The Jerach festival ...... every year. a) has happened b) have been 5) Arcaeologists have..........that Gobekli Tepe.. a) discover b) discovered

ex 3

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