Great changes _______ in our country since 1990.
A．were taken placeB．took place
C．have taken placeD．have been taken place
C
考查被動語態(tài)和現(xiàn)在完成時。句意“自從1990年以來，我們國家復(fù)數(shù)了巨大的變化。”take place沒有被動形式，排除A、D；since+時間點(diǎn)常用于現(xiàn)在完成時。故選C。
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