Standing tall as the defining landmark of Toronto is the CN Tower, Canada’s National Tower. On 553.33 metres, it is the world

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问题    Standing tall as the defining landmark of Toronto is the CN
   Tower, Canada’s National Tower. On 553.33 metres, it is the world’s 【S1】______
   tallest freestanding tower and a symbol of Canadian achievement
   recognized around the world. This architectural triumph is an
   engineering wonder of the modern world and widely regarded as the
   iconic symbol of tourism for Toronto. With breathtaking views from
   three observation levels, the CN Tower is a worldly class entertaining 【S2】______
   and dining destination and must-see attraction when visiting Toronto.
   The CN Tower has dominated Toronto’s skyline during daylight
   hours since it opened 31 years before. But at night, the dimly lit giant 【S3】______
   fades nearly to black. Not anymore. Last week, it was illuminated 【S4】______
   for the first time in a dazzling light show. CN Tower can now claim
   to be the world’s tallest illuminated structure. The newly lit tower
   will consume up 60 percent less electricity than the old scheme. It 【S5】______
   is an energy efficient, costly effective and architecturally 【S6】______
   stunning result that whole Canadians can be proud of. On 【S7】______
   a clean night, residents will be able to spot the illuminated 【S8】______
   tower. It is hoped that the new lighting will help end Toronto’s five-
   year tourist slump. It will serve as a beacon for tourism representing
   extraordinary experiences that can be found in Toronto and throughout 【S9】______
   Canada. Throughout the year, the lighting will pay attribute to national 【S10】______
   holidays, special occasions and some citywide events.
【S3】

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答案before改成ago

解析 本题辨析近义词before和ago。before和ago的区别在于时间参照点的不同,虽然都翻译成“之前”,但是两者的意义是完全不同的。before是以过去某一个时间点为参照,而ago是以说话时间为参照点的。一般来说,含有ago的时间状语与一般过去时搭配,而含有before的时间状语一般和过去完成时搭配。如We met two years ago./The center had been opened some years before.文中的opened这个动作是以说话时间为参照点,所以要用ago。
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