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
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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
单项选择题
The heavily-populated area was a breeding place for ______ diseases.
A．infectious
B．powerful
C．influential
D．suspicious
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