The past 30 years__________ the great changes that have taken place in my hometown.
A．sawB．was seenC．have seenD．see
C

試題分析：表示過(guò)去的某一動(dòng)作或行為一直持續(xù)到現(xiàn)在，故用現(xiàn)在完成時(shí)。
點(diǎn)評(píng)：現(xiàn)在完成時(shí)可以表示動(dòng)作發(fā)生在過(guò)去，但一直持續(xù)到現(xiàn)在，并且有可能持續(xù)下去。
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