单项选择题

A．He’s preparing for a test.
B．He lost his notes.
C．He missed the class.
D．He’s studying this subject.
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单项选择题
A．He has been shopping around.B．He has been looking for a job.C．He has been dining in a restaurant.D．He has been driving the cab.
A．He has been shopping around.
B．He has been looking for a job.
C．He has been dining in a restaurant.
D．He has been driving the cab.
单项选择题
A．Less than 15 hours.B．15 Hours on average.C．Up to 20 hours.D．30 hours at most.
A．Less than 15 hours.
B．15 Hours on average.
C．Up to 20 hours.
D．30 hours at most.
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