单项选择题

The scientist Galileo claimed that the earth ______ around the sun.

A．moves
B．moved
C．is moving
D．was moving
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单项选择题
I found ______ hard to concentrate.
A．this
B．that
C．it
D．what
单项选择题
In case of something unexpected, it is advisable to ______ your life against accident.
A．insure
B．ensure
C．assure
D．be sure
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