单项选择题

It's getting dark; we'd better make（）home.

A.out
B.up
C.for
D.of

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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

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

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