1.the children are required not to leave the buliding unless

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1.the children are required not to leave the buliding unless __ to do so
A.be told
B.told
2.Shanghai has experienced such great changes that everyone can recognize that it is no longer__
A.what it used to
B.what it used to be

1、选B.译作：“孩子们被要求不得离开大楼,如果他们未被要求这样做”
分析：unless=if not 此类条件状语从句可根据“主祈从现（主句祈使句,从句现在时）”原则,本句可作“...unless they are told to do so=...if they are not told to do so”,省略they,即可得本题答案.
2、选B.译作：“上海发生了如此巨大的变化乃至每个人都能认识到它不再是过去那样子了”
分析：根据句意,可见此处be used to 作“过去...”解,即be used to do而不是be used to doing（习惯于...）.故而,此时to为不定式,后不可无宾语；同时,be具有表示“某一状态；某一样子；某种形态”的含义.综上所述,可得本题答案.

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