16．Beijing isn't what it used to be．The last decade        great changes in the city images．（　　）
A．witnessedB．was witnessedC．has witnessedD．had witnessed

分析 北京不再是過去的樣子了，過去十年已經見證了該市形象的巨大變化．

解答 答案：C．根據(jù)主語"The last decade"可知"過去十年已經見證了該市形象的巨大變化"所以謂語動詞用現(xiàn)在完成時，表示從過去開始一直到現(xiàn)在的動作．因此答案是C．

點評 本題考查現(xiàn)在完成時．
現(xiàn)在完成時表示過去發(fā)生的動作對現(xiàn)在造成的影響或結果或表示過去的動作或狀態(tài)持續(xù)到現(xiàn)在．它的構成是：主語+have/has+動詞的過去分詞．

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