单项选择题

They have done things they ought ______.

A．not to do
B．not to be done
C．not to have done
D．not having done
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单项选择题
The main idea of the first paragraph is ______.
A．life on land probably began about 4, 300 years ago
B．the first animal on land came from oceans
C．there wouldn"t be animals without plants
D．plants are the only form of life that is able to get and store energy
单项选择题
That contract, about ______ we had a disagreement last month, had now gone through.
A．whom
B．which
C．what
D．that
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