单项选择题

A．Four.
B．Five.
C．Three.
D．Seven.
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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．200, 000 tons.B．2 million tons.C．20 million tons.D．2,000 tons.
A．200, 000 tons.
B．2 million tons.
C．20 million tons.
D．2,000 tons.
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