单项选择题

Alight with no more power than ______ by an ordinary electric light bulb becomes intensely strong as it is concentrated to a pinpoint-sized beam.

A．as is produced
B．that produced
C．that is produced
D．produced
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单项选择题
The teacher didn't know who ______ for the broken glass.
A．blamed
B．would blame
C．to blame
D．be blamed
单项选择题
She most be in the dormitory now! No, she ______ be there. I saw her in tile classroom a minute ago.
A．mustn't
B．can't
C．couldn't
D．wouldn't
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