1.Katrina was the costliest and one of the deadliest hurricanes to ever strike the United States.

to ever strike不定式做后置定语，修饰hurricane。

2.The group plans to build a total of one hundred fifty houses.

a total of总计为,总共…

例句：A total of 103 beds are being closed for good because of a shortage of cash.
      由于缺少现金，总计103张床位被永久取消了。

3.However, everyone agrees that the city is still in great need of safe and affordable housing.

in need of需要,急需…

例句：The brickwork in this house is in need of repair.
      这所房子的砖造部分需要修理。

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