单项选择题

This book ______ me twenty dollars.

A．is cost
B．was cost
C．cost
D．have been cost
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单项选择题
Eighty percent of television viewers chose him as their ______ host.
A．fortunate
B．favorite
C．preferred
D．preferable
单项选择题
The man confessed that he ______ a murder.
A．did
B．conducted
C．committed
D．performed
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