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

分析 在過(guò)去的二十年里，中國(guó)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(shí)間狀語(yǔ)Over the past decades，確定句子時(shí)態(tài)為現(xiàn)在完成時(shí)，再根據(jù)語(yǔ)境the freeway network 和expand之間是被動(dòng)關(guān)系，故用has been expanded．

點(diǎn)評(píng) 對(duì)于單詞短語(yǔ)的識(shí)記，要從詞義著手，理解詞性和常見(jiàn)用法或搭配，并能在語(yǔ)境中靈活運(yùn)用．

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