Great changes _________ in my hometown in the past 20 years.
A．took the placeB．have taken placeC．were taken placeD．took place
B
考查時態(tài)和語態(tài)。Take place發(fā)生，無被動語態(tài)，排除C；took the place是代替……的位置，不符合句意，排除A；再根據(jù)時間狀語in the past 20 years，可知要用現(xiàn)在完成時態(tài)。所以選B。
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