Great changes_____ in the small city in the last 20 years.
A．have taken placeB．took placeC．had taken placeD．a(chǎn)re happening
A
考查時態(tài)：時間是in the last 20 years，和現(xiàn)在完成時連用，句意是：在過去的20年里，這個小鎮(zhèn)已經(jīng)發(fā)生了巨大的改變。選A。
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