单项选择题

The police officer has begun to ______ the case.

A．look out
B．look into
C．look on
D．look over
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单项选择题
He didn't get the job. If only he ______ his father's advice.
A．had taken
B．have taken
C．take
D．took
单项选择题
He ______ a very interesting novel at six p. m. yesterday.
A．is reading
B．were reading
C．was reading
D．read
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