[-B65] The thirty-storey building is one of the most challenging engineering projects they haveever _____ .A.undergoneB.overtakenC.understoodD.undertaken翻译并分析

[-B65] The thirty-storey building is one of the most challenging engineering projects they haveever _____ .A.undergoneB.overtakenC.understoodD.undertaken翻译并分析
[-B65] The thirty-storey building is one of the most challenging engineering projects they have
ever _____ .
A.undergone
B.overtaken
C.understood
D.undertaken
翻译并分析

[-B65] The thirty-storey building is one of the most challenging engineering projects they haveever _____ .A.undergoneB.overtakenC.understoodD.undertaken翻译并分析
undergo vt.经历,经受；忍受
overtake vt.赶上；压倒；突然来袭
understand vt.懂；理解；获悉；推断；省略
undertake vt.承担,保证；从事；同意；试图
这句话的意思是这幢楼是他们从事过的最具有挑战性的工程项目之一了

undertake有“从事、进行、着手做”的意思。这句话的意思是：这座30层的大楼是他们迄今为止做过的最富挑战性的工程之一。