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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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
单项选择题
Students in this university are forbidden ______ out of the main gates of the university after 11 p.m.
A．going
B．to go
C．having gone
D．their going
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