单项选择题

A．200, 000 tons.
B．2 million tons.
C．20 million tons.
D．2,000 tons.
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单项选择题
A．He has been ill.B．He hasn’t yet found a topic.C．He was busy studying for an exam.D．He didn’t know when it was due.
A．He has been ill.
B．He hasn’t yet found a topic.
C．He was busy studying for an exam.
D．He didn’t know when it was due.
单项选择题
A．Four.B．Five.C．Three.D．Seven.
A．Four.
B．Five.
C．Three.
D．Seven.
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