单项选择题

The World Trade Center, the top ______ was 410 meters high, was the tallest building in the world.

A．which
B．of which
C．of whose
D．that
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单项选择题
The Car Club couldn't ______ to meet the demands of ail its members.
A．assume
B．ensure
C．guarantee
D．confirm
单项选择题
Humidity is so intense in some parts of the tropics that Europeans find they are unable to ______ it.
A．maintain
B．persist
C．endure
D．sustain
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