单项选择题

How long has Mr. Wang been here

A．He arrived here three hours ago.
B．He’ s been here for an hour.
C．He came here half an hour ago.
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The labels inside the clothes tell you how to keep them looking their best.
A．Right.
B．Wrong.
C．Doesn’ t say.
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Who gave a talk at the meeting
A．A famous writer.
B．A famous scientist.
C．A famous doctor.
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