单项选择题

In the Middle Ages people believed it was the earth, not the sun, _____ the center of our planetary system.

A．was that
B．that was
C．was
D．that
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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
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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