①NO Smoking should___ (see) in stores in many parts of the city.②A museum___(build) now in our city.

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①NO Smoking should___ (see) in stores in many parts of the city.②A museum___(build) now in our city.

①NO Smoking should___ (see) in stores in many parts of the city.②A museum___(build) now in our city.
①NO Smoking should___ (see) in stores in many parts of the city.
②A museum___(build) now in our city.

①NO Smoking should___ (see) in stores in many parts of the city.②A museum___(build) now in our city.
be seen
is being built
被动语态:be+过去分词
第一个是最正常的用法
第二个有now,所以是现在进行时的被动语态,be being+过去分词