单项选择题

The investigators ______ for lunch.

A．process
B．excess
C．recess
D．access
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单项选择题
The lecturer explained the Water Gate scandal vigorously ______ and every student was attracted by his detailed and vivid presentation.
A．at length
B．lengthily
C．at last
D．at all
单项选择题
She ______ high levels of lead in her drinking water.
A．perceived
B．spotted
C．detected
D．discerned
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