单项选择题

The paper should be ______ thicker than this.

A．a few
B．few
C．a little
D．little
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单项选择题
The children went there to watch the iron tower ______ .
A．to build
B．building
C．be built
D．being built
单项选择题
We ______ that he is quite untrust--worthy.
A．have found
B．have discovered
C．have invented
D．have looked for
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