单项选择题

The law requires that everyone（）his car checked at least once a year.

A、 has
B、 had
C、 have
D、 must have

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单项选择题
Once environmental damage（）, it takes many years for the system to recover.

A、 had done
B、 is done
C、 is to do
D、 does
单项选择题
Many scientists（）their own eyes and ears than the theories of the ancients.

A、 would rather to believe
B、 would rather believe
C、 rather would believe
D、 will rather believe
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