单项选择题

There were a number of people already （） on the platform.

A．sit
B．to sit
C．sitting
D．having sat

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单项选择题

Leaders from all over the world （） together at the United Nations since 1952.

A．work
B．are working
C．have worked
D．have been working

单项选择题

Splendid （） the architecture of Manhattan with its one hundred and more skyscrapers.

A．is
B．are
C．do
D．does

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