单项选择题

We lost our way in the desert, and _____ made matters worse was that we ran out of water.

A．it
B．that
C．which
D．what
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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
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
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