单项选择题

Crew chiefs supervised engines, switches and lights that told them how each item of equipment was functioning.

A．observed
B．preserved
C．monitored
D．nurtured
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单项选择题
In view of obstruction and disappointment, the prime minister decided to make parliamentary alliance.
A．frustration
B．illustration
C．capitulation
D．clarification
单项选择题
The plan would require two, or possibly more, class periods for its fulfillment.
A．execution
B．excursion
C．expansion
D．extinction
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