单项选择题

The company manager requested that his employees ______ while working.

A．shouldn"t smoke
B．don"t smoke
C．not smoke
D．didn"t smoke
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单项选择题
Not until the visitors came to Hainan ______ how great the city is.
A．they will know
B．did they know
C．they knew
D．will they know
填空题
Which country has most of the tallest building in the worldIt is ______.
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