单项选择题

His office on the fortieth floor of a skyscraper in the center of New York City is the world（）

A．that he works
B．which he works
C．he works in
D．he works

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单项选择题
（）such work before, she asked advice,from many experienced workers and planned everything carefully.

A．Having never done
B．Having been done
C．Having done
D．Never having done
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