16．Over the past decades，the freeway network in Chinahas been expanded （expand） greatly．

分析 在過去的二十年里，中國高速公路網(wǎng)絡(luò)已經(jīng)得到極大的擴(kuò)張．

解答 答案：has been expanded
根據(jù)句子里的時間狀語Over the past decades，確定句子時態(tài)為現(xiàn)在完成時，再根據(jù)語境the freeway network 和expand之間是被動關(guān)系，故用has been expanded．

點評 對于單詞短語的識記，要從詞義著手，理解詞性和常見用法或搭配，并能在語境中靈活運用．

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