单项选择题

Scientists have found that there are four levels of sleep, each _____ a little deeper than the one before.

A．is
B．was
C．being
D．to be
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单项选择题
A survey was carried out on children’s attitudes to violence on television, _____ was surprising.
A．the result
B．its result
C．which results
D．the result of which
单项选择题
I talked with Julia in the classroom just a minute ago. She _____ to the cinema.
A．hadn’t gone
B．shouldn’t have gone
C．can’t have gone
D．wouldn’t have gone
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