单项选择题

A．Mark the latest homework assignment.
B．Put a cancellation notice on the classroom door.
C．Make an appointment with the doctor.
D．Return some exams to his students.
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Possible sources for the hydrogen are both electrolysis of water and ______.
单项选择题
A．He agrees with the woman,B．He hasn’t been to a game recently.C．He doesn’t know much about basketball.D．He doesn’t think the team has been playing well.
A．He agrees with the woman,
B．He hasn’t been to a game recently.
C．He doesn’t know much about basketball.
D．He doesn’t think the team has been playing well.
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