单项选择题

The policeman kept his eyes ________ on the screen of the computer to identify the criminal's footprints.

A．fixed
B．fixing
C．being fixed
D．to fix
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单项选择题
It is required that anyone applying for a driver's license _____ a set of tests.
A．take
B．takes
C．took
D．will take
单项选择题
Tom ________the party as no one saw him there yesterday evening.
A．can't attend
B．mustn't attend
C．won't have attended
D．couldn't have attended
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