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
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单项选择题
She ______ high levels of lead in her drinking water.
A．perceived
B．spotted
C．detected
D．discerned
单项选择题
Mary has a 15-year contract with the company. By June next year, Mary ______ with this company for 14 years.
A．will have been working
B．will have worked
C．will work
D．works
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