单项选择题

The first three aeroplanes of a new type______.

A．are only for show
B．are all destroyed
C．are later broken up for spare parts
D．are used for testing purposes
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单项选择题
We are told that George expected Jim to help ______ .
A．prove him innocent
B．him turn over a new leaf
C．lighten his punishment
D．him escape from prison
单项选择题
The examination has been cancelled. You ______ all that revision, after all.
A．didn't need to have done
B．needn't have done
C．need to do
D．needn't do
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