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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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
单项选择题
Tom ought not to（）me your secret, but he really meant no harm.

A、 have told
B 、tell
C、 be telling
D、 having told
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