单项选择题

A power failure created ______ in transportation.

A．enclosure
B．emergency
C．extension
D．excitement
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单项选择题
A．presentB．offerC．withD．extend
A．present
B．offer
C．with
D．extend
单项选择题
A．treatedB．had been treatedC．had treatedD．was treated
A．treated
B．had been treated
C．had treated
D．was treated
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