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．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.
单项选择题
A．They are more convenient.B．Their storage space is more accessible.C．They are more energy-efficient.D．They take up less floor area.
A．They are more convenient.
B．Their storage space is more accessible.
C．They are more energy-efficient.
D．They take up less floor area.
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